# Dog Diarrhea with Worms: What to Do and How to Treat


## Key Takeaways

- Visible worms in stool or diarrhea necessitate prompt veterinary attention for diagnosis and prescription deworming medication, as over-the-counter products are unreliable and potentially dangerous due to varying drug classes and required weight-based dosing.
- Severe clinical signs such as repeated vomiting, collapse, pale gums, or bloody/tarry diarrhea indicate potential emergencies requiring immediate veterinary intervention, possibly pointing to heavy parasite loads, intestinal blockage, or serious infections like parvovirus.
- Intestinal parasites like roundworms, hookworms, whipworms, and tapeworms cause diarrhea by irritating the intestinal lining, leading to increased fluid production and accelerated digestion, with heavy infections potentially causing bleeding and anemia, particularly in young or immunocompromised animals.
- Home treatment is strongly discouraged; human antidiarrheal medications can be toxic to dogs, and incorrect dewormer selection or dosage can exacerbate the condition or lead to toxicity, underscoring the need for veterinary diagnosis via fecal flotation to identify specific parasites.
- Prevention strategies include daily stool removal to break the parasite life cycle, year-round parasite preventive plans (often combined with heartworm medication), regular veterinary fecal testing (at least annually), and controlling scavenging behaviors to minimize exposure to infectious eggs and larvae.
- Post-treatment, a follow-up fecal test 2-4 weeks later is crucial to confirm parasite eradication, as some treatments only target adult worms and a second dose may be required to eliminate immature stages, preventing reinfection.

---

If you see worms in your dog's diarrhea, call your veterinarian today. This is not usually a midnight emergency, but it does need same-day attention. Worms in the stool mean your dog has an intestinal parasite infection that requires prescription medication. Do not wait several days to see if it clears on its own. Diarrhea with worms can cause dehydration and weight loss, especially in puppies and small dogs.

Go to an emergency vet immediately if your dog shows any of these signs: repeated vomiting, bloody or black tarry diarrhea, collapse, pale gums, a swollen or painful belly, or if your dog is very young, very old, or already weak. These can point to a heavy parasite load, a blocked intestine, or a serious infection like parvovirus. When in doubt, call your vet's office and describe exactly what you see.

## Is This an Emergency?


<!-- figure:auto -->
```figure
{
 "type": "triage",
 "title": "Urgency triage by severity of signs",
 "tiers": [
  {
   "tier": "danger",
   "label": "Go to emergency vet now",
   "signs": [
    "Repeated vomiting, especially if your dog cannot keep water down",
    "Blood in diarrhea, either bright red streaks or dark, tarry, sticky stool",
    "Collapse, weakness so severe your dog cannot stand",
    "Pale or white gums"
   ],
   "action": [
    "Call the emergency clinic on the way",
    "Bring a fresh stool sample if you can",
    "Do not offer food or water until a vet examines your dog"
   ]
  },
  {
   "tier": "warn",
   "label": "Book a same-day appointment",
   "signs": [
    "Worms visible in diarrhea or in fresh stool",
    "Diarrhea that lasts more than 24 hours",
    "Diarrhea with vomiting that happens once or twice but stops",
    "Your dog is eating and drinking but has loose stools three or more times in a day"
   ],
   "action": [
    "Call your regular vet this morning",
    "Collect a stool sample in a clean container and refrigerate it until your visit",
    "Keep your dog away from other pets and from public walking areas"
   ]
  },
  {
   "tier": "safe",
   "label": "Watch at home for up to 24 hours",
   "signs": [
    "One or two soft stools, no worms seen, your dog is acting normal, eating well, drinking normally, and has no vomiting",
    "You recently changed food or gave a new treat",
    "Your dog is an adult with no other health conditions"
   ],
   "action": [
    "Monitor closely",
    "Count how many times your dog poops and note the consistency",
    "If diarrhea continues past 24 hours, or if worms appear, call your vet"
   ]
  }
 ]
}
```

| Urgency Level | Signs You Can Observe | What to Do |
|---|---|---|
| Go to emergency vet now | Repeated vomiting, especially if your dog cannot keep water down. Blood in diarrhea, either bright red streaks or dark, tarry, sticky stool. Collapse, weakness so severe your dog cannot stand. Pale or white gums. A belly that feels tight, painful, or swollen. Diarrhea with worms in a puppy under 6 months old that also has a fever or is not eating. | Call the emergency clinic on the way. Bring a fresh stool sample if you can. Do not offer food or water until a vet examines your dog. |
| Book a same-day appointment | Worms visible in diarrhea or in fresh stool. Diarrhea that lasts more than 24 hours. Diarrhea with vomiting that happens once or twice but stops. Your dog is eating and drinking but has loose stools three or more times in a day. You see worms in your dog's vomit. Your dog has lost weight or has a dull coat. | Call your regular vet this morning. Collect a stool sample in a clean container and refrigerate it until your visit. Keep your dog away from other pets and from public walking areas. |
| Watch at home for up to 24 hours | One or two soft stools, no worms seen, your dog is acting normal, eating well, drinking normally, and has no vomiting. You recently changed food or gave a new treat. Your dog is an adult with no other health conditions. | Monitor closely. Count how many times your dog poops and note the consistency. If diarrhea continues past 24 hours, or if worms appear, call your vet. Do not give any medication without veterinary approval. |

## What You Are Likely Seeing

The most common worms found in dog stool are roundworms, hookworms, whipworms, and tapeworms. Roundworms look like pale, spaghetti-like strands that can be several inches long. Tapeworms look like small, flat, moving segments that resemble grains of rice. Hookworms and whipworms are much smaller and harder to see with the naked eye, so your dog may have them even if you see nothing in the stool.

When worms irritate the intestinal lining, the gut produces extra fluid and speeds up digestion, which leads to diarrhea. The worms themselves can also block the passage of food and cause inflammation. In heavy infections, worms can cause bleeding in the gut, which turns stool dark and tarry or streaked with red. The [MSD Veterinary Manual for dog owners](https://www.msdvetmanual.com/dog-owners/digestive-disorders-of-dogs) explains that intestinal parasites are a common cause of diarrhea in dogs and that identifying the specific parasite requires a stool examination.

## Why You Cannot Treat This at Home

Over-the-counter dewormers are not reliable and can be dangerous. Different worms require different medications, and the dose must be based on your dog's exact weight. A dose that is too low will not kill the worms. A dose that is too high can poison your dog. Your veterinarian will examine a stool sample under a microscope to identify the parasite, then prescribe the correct drug and dose for your dog's size and health.

Do not give your dog any human medication for diarrhea. Many human antidiarrheal drugs are toxic to dogs. Your vet may recommend a specific deworming product and may also prescribe a medication to soothe the gut, but only after they know what they are treating. The [American Veterinary Medical Association's pet owner resources](https://www.avma.org/resources-tools/pet-owners) emphasize that working with your veterinarian is the safest way to manage your pet's health, especially when the cause of a symptom is not yet known.

## What Else Could Be Going On

Diarrhea with worms does not always mean worms are the only problem. Your dog could have a bacterial infection, a viral infection like parvovirus, a dietary indiscretion from eating something rotten, or an inflammatory bowel condition. Worms can also weaken the gut lining, making it easier for other infections to take hold.

Parvovirus is a serious concern in puppies. It causes severe, often bloody diarrhea, vomiting, and lethargy, and it can be fatal without intensive treatment. If your puppy is unvaccinated or incompletely vaccinated and has diarrhea with worms, your vet will likely test for parvovirus as well as parasites. The [AAHA pet parent guidance](https://www.aaha.org/for-pet-parents/) notes that preventive care, including vaccination and regular fecal testing, is the best defense against many infectious causes of diarrhea.

## What to Expect at the Vet

Your vet will ask when the diarrhea started, how often your dog poops, what the stool looks like, and whether your dog has vomited. They will examine your dog and collect a fresh stool sample. The sample is mixed with a solution that makes parasite eggs float to the top, so they can be seen under a microscope. This test is called a fecal flotation.

Depending on what is found, your vet may prescribe a dewormer, an antibiotic, or both. They may also recommend a bland diet for a few days to give the gut time to heal. Puppies often need a second deworming dose two to four weeks later, because the first dose kills adult worms but not eggs or larvae. Your vet will tell you exactly when to repeat the treatment.

If your dog is dehydrated from the diarrhea, the vet may give fluids under the skin or through an IV. Most dogs with worms and diarrhea recover fully with prompt treatment. The key is to get a diagnosis and the right medication, not to guess at home.

## What You Can Safely Do at Home Right Now

If your dog has diarrhea and you can see worms, your first job is to protect everyone in the house. Some worms that infect dogs can also infect people, especially children. Wash your hands thoroughly after handling your dog, cleaning up stool, or touching bedding. Wear gloves when you pick up feces. Keep small children away from the area where your dog eliminates.

You can offer your dog small amounts of water frequently to prevent dehydration. Ice cubes to lick are a good option if your dog is drinking too fast. Do not force your dog to drink.

Do not give any over-the-counter anti-diarrheal medication. Many human products are toxic to dogs. Do not give any deworming medication you have at home from a previous illness. The dose depends on your dog's current weight, and the type of worm matters. Giving the wrong drug or dose can make your dog sicker.

Do not feed your dog a large meal. A bland diet of boiled white rice with plain boiled chicken or lean ground turkey, no salt, no oil, no seasoning, can help settle the stomach. Offer small portions every few hours. If your dog refuses food for more than 12 hours, call your veterinarian.

Do not try to remove worms from your dog's stool or rear end with your bare hands. If worms are visible around the anus, you can wipe the area gently with a damp cloth while wearing gloves. Save a stool sample in a sealed plastic bag or clean container. Keep it cool, not frozen, and bring it to your appointment.

## What to Write Down Before You Call the Vet

Your veterinarian will need specific information. Write these things down before you call:

- How many times has your dog had diarrhea in the last 24 hours? Count each episode.
- When did you first notice worms? Was it in the stool, on the fur, or in vomit?
- What did the worms look like? Long and spaghetti-like, or short and rice-like?
- Is your dog eating and drinking normally?
- Is your dog vomiting? How many times?
- Is your dog still active, or is it lethargic and unwilling to move?
- Have you seen blood in the stool? Fresh red blood or dark, tarry stool?
- When was your dog last dewormed, and with what product?
- Does your dog have access to rodents, raw meat, or other animals' feces?
- Are there puppies or elderly dogs in the home?

Measure your dog's gum color. Lift the lip and look. Healthy gums are pink, like your own. Pale, white, or gray gums can signal blood loss or severe dehydration. This is an emergency. Also count your dog's breathing rate at rest. More than 30 breaths per minute while resting is a concern.

## Visual Guide to Common Worms

| Worm Type | What It Looks Like in Stool | Other Signs You May See |
| --- | --- | --- |
| Roundworms | Long, pale, spaghetti-like strands, often coiled | Pot-bellied appearance, vomiting worms, poor growth in puppies |
| Hookworms | Very small, thin, hard to see with the naked eye | Dark, tarry stool, pale gums, weakness, weight loss |
| Whipworms | Small, thread-like, shaped like a whip | Mucus in stool, straining to defecate, weight loss |
| Tapeworms | Flat, white, rice-like segments, sometimes moving | Scooting on the floor, licking the rear, segments stuck to fur |
| Coccidia | Not visible to the naked eye | Watery diarrhea, sometimes with blood, dehydration |

If you cannot see worms but your dog has persistent diarrhea, worms may still be present. Many worm eggs are microscopic and only show up on a fecal test. The [MSD Veterinary Manual](https://www.msdvetmanual.com/dog-owners/digestive-disorders-of-dogs) explains that a stool sample is often needed to identify the specific parasite.

## The Deworming Schedule Table

Deworming is not a one-time event. Puppies need repeated treatments because they can be born with worms or pick them up from their mother's milk. Adult dogs need regular preventive deworming based on their lifestyle.

| Dog Age or Situation | Recommended Deworming Frequency |
| --- | --- |
| Puppies, 2 to 12 weeks | Every 2 weeks |
| Puppies, 12 weeks to 6 months | Monthly |
| Adult dogs, low risk (indoor only) | Every 3 to 6 months |
| Adult dogs, high risk (hunting, raw diet, outdoor access) | Monthly |
| Pregnant or nursing females | Follow your veterinarian's schedule |
| Dogs with a confirmed worm infection | Follow-up fecal test 2 to 4 weeks after treatment |

This table is a general guide. Your veterinarian will adjust the schedule based on your dog's specific risk factors and the worms found in your area. The [American Animal Hospital Association](https://www.aaha.org/for-pet-parents/) recommends working with your veterinary team to build a parasite prevention plan tailored to your pet.

## What a Veterinary Visit Usually Involves

Your veterinarian will start by asking the questions you wrote down. Then they will perform a physical exam. They will feel your dog's abdomen to check for pain, bloating, or masses. They will listen to the heart and lungs. They will check your dog's hydration by pinching the skin on the back of the neck and looking at the gums.

The most common test is a fecal flotation. A small amount of stool is mixed with a solution that makes worm eggs float to the top, where they can be seen under a microscope. This test identifies the specific worm type. Sometimes a fresh stool sample is examined directly under a microscope to look for moving worms.

Bloodwork may be recommended if your dog is severely dehydrated, anemic, or showing signs of systemic illness. Anemia, a low red blood cell count, can result from hookworms feeding on blood. In young puppies, this can be life-threatening.

Treatment usually involves a deworming medication. The specific drug and dose depend on the worm type and your dog's weight. Your veterinarian will determine the correct dose. Never use a leftover prescription from another pet. Some worms require a second dose two to four weeks later to catch newly hatched worms.

Costs vary widely by region and clinic. A fecal test typically ranges from $30 to $80. A physical exam ranges from $50 to $150. Deworming medication ranges from $20 to $100 depending on the drug and your dog's size. Bloodwork adds $100 to $300. These are general ranges, not quotes. Ask your clinic for an estimate before treatment begins.

## When an Online Vet Can Help, and When It Cannot

Any situation in this article that involves pale gums, severe lethargy, repeated vomiting, refusal to drink, or dark tarry stool requires hands-on care. Do not use a remote consultation for these signs. Go to an emergency clinic immediately. A remote vet cannot take a temperature, feel your dog's abdomen, or run a fecal test. If your dog is collapsing, seizing, or unable to stand, that is an emergency. Call your nearest emergency hospital and go.

A remote consultation is genuinely useful for early or mild presentations. If your dog had one loose stool and you saw a worm segment, a video call can help you decide whether a visit is needed today. If your dog is on a deworming plan and you have a question about side effects, a remote vet can advise. If you are unsure whether a sign warrants a visit, a remote vet can help you triage.

A remote vet can take a history, look at visible signs on video, and advise you on next steps. In many states, they can prescribe medication. However, they cannot palpate the abdomen, listen to the chest, take a temperature, run bloodwork, or image anything. Prescribing rules differ by state. A veterinarian may require an in-person examination before prescribing deworming medication. The [American Veterinary Medical Association](https://www.avma.org/resources-tools/pet-owners) advises that a valid veterinarian-client-patient relationship is the foundation of proper care, and that relationship often starts with an in-person visit.

## What to Expect After Treatment

Most dogs improve within 24 to 48 hours after the correct deworming medication. Diarrhea should gradually firm up. You may see dead worms passed in the stool for a few days. This is normal and expected.

If diarrhea continues for more than 48 hours after treatment, or if your dog's condition worsens, call your veterinarian. Persistent diarrhea can indicate a different parasite, a bacterial infection, or an underlying condition like inflammatory bowel disease. The [MSD Veterinary Manual Pet Owner Version](https://www.msdvetmanual.com/pet-owners) notes that diarrhea has many causes, and a single treatment may not resolve the problem if another condition is present.

Keep your dog isolated from other pets until the diarrhea resolves. Clean all bedding, food bowls, and toys with hot, soapy water. Pick up feces from your yard daily and dispose of it in a sealed bag. Some worm eggs survive in soil for months, so regular cleanup is part of prevention.

Your veterinarian will likely recommend a follow-up fecal test two to four weeks after treatment. This confirms the worms are gone. Skipping this step can allow a silent reinfection to continue.

## Common Mistakes Owners Make

Seeing worms in diarrhea is alarming, and it is easy to react quickly. Some common responses can delay recovery or make things worse.

**Mistake: Giving a human deworming medication.** Human parasite drugs are not the same as veterinary products. The dose for a dog is different, and some human formulations contain ingredients that are toxic to dogs. Only a veterinarian can choose a safe product and the correct dose for your dog's weight and condition.

**Mistake: Repeating a dewormer from months ago.** The product may be expired, or it may not cover the specific parasite your dog has. Some worms require a specific drug class, and a single dose often is not enough. Using the wrong product can leave the infection active.

**Mistake: Stopping treatment when the diarrhea stops.** Diarrhea can improve before the worms are gone. Many deworming protocols require a second dose two to four weeks later to catch newly hatched worms. Skipping that follow-up dose is a common reason for reinfection.

**Mistake: Assuming the worms are the only problem.** Worms can cause diarrhea, but so can other conditions. If your dog has a dietary sensitivity, a bacterial infection, or another illness, deworming alone will not fix the diarrhea. A veterinarian needs to examine your dog to rule out other causes.

**Mistake: Ignoring hygiene.** Worm eggs pass in stool and can survive in soil for months. If you clean up the mess but do not disinfect the area or wash your hands thoroughly, your dog can swallow eggs again and reinfect itself.

| Common Mistake | Better Action |
| --- | --- |
| Giving human deworming medication | Call your vet for a dog-specific product and dose |
| Using an old dewormer from your cabinet | Get a fresh diagnosis and current treatment plan |
| Stopping treatment when diarrhea stops | Finish the full deworming schedule your vet prescribes |
| Treating worms without a vet visit | Have your vet examine your dog and test the stool |
| Cleaning up without disinfecting | Remove stool daily and wash your hands well |

## How to Reduce the Chance of It Happening Again

Prevention starts with daily stool removal. Pick up feces from your yard every day, because worm eggs need time in the environment to become infectious. Removing stool quickly breaks that cycle.

Wash your hands after handling your dog, its stool, or its bedding. Worm eggs are microscopic and can stick to surfaces you cannot see. This protects you and your family as well as your dog.

Keep your dog on a year-round preventive plan. Many heartworm preventives also protect against intestinal parasites, but not all of them cover every worm type. Ask your veterinarian which product matches the risks in your area. This is a routine part of preventive care, and your vet can recommend a schedule based on your dog's lifestyle. The American Veterinary Medical Association offers guidance on working with your veterinarian to build a preventive care plan.

Control hunting and scavenging. Dogs that eat rodents, birds, or feces from other animals are far more likely to pick up worms. Keep your dog on a leash in areas where wildlife is common, and discourage coprophagia, which is the eating of stool.

Have your dog's stool checked at least once or twice a year. A fecal flotation test can find worm eggs even when you cannot see worms. This is especially important for puppies and for dogs that spend time in parks or kennels.

## What Recovery and Ongoing Management Look Like

Most dogs improve within a few days of the correct deworming treatment. Diarrhea often begins to firm up within 24 to 72 hours, but it can take a week or more for the gut to fully settle. Your veterinarian may recommend a bland diet for a few days to give the intestines time to heal.

You may see dead worms in your dog's stool for several days after treatment. This is normal and is a sign the medication is working. If you see live worms after five to seven days, contact your veterinarian.

Your vet will likely ask you to bring in a fresh stool sample two to four weeks after the first treatment. This confirms the worms are gone and checks for new eggs. Some parasites, such as roundworms, require repeated dosing because the first treatment kills the adults but not the immature stages.

Follow-up care matters. If your dog still has diarrhea after a week, or if it loses weight, vomits, or seems tired, return to your veterinarian. Persistent diarrhea can point to a different problem that needs its own treatment. The MSD Veterinary Manual notes that chronic diarrhea has many possible causes and often requires diagnostic testing to identify the specific issue.

## Frequently Asked Questions

**Can I catch worms from my dog?**
Yes, some intestinal worms can pass from dogs to people. Roundworms and hookworms are the main concerns. Children are at higher risk because they play in soil and may not wash their hands. The best protection is deworming your dog on schedule, removing stool daily, and washing your hands after any contact with your dog or its waste. If you are worried about your own health, speak with your doctor and mention that your dog had worms.

**How long does it take for the worms to go away?**
Most deworming medications kill adult worms within 24 to 48 hours. You may see dead worms in the stool for several days. However, the full treatment course can last several weeks because some drugs only kill adult worms, not eggs or larvae. Your veterinarian will tell you when to give the follow-up dose and when to bring in a new stool sample to confirm the infection is gone.

**My dog has diarrhea but I only saw worms once. Do I still need to treat?**
Yes. Seeing worms once means your dog has an active infection, even if you do not see them again. Worms can shed eggs intermittently, and the diarrhea may continue even when no worms are visible. A stool test can confirm the type of worm and guide the right treatment. Treating only when you see worms leaves the infection in place.

**Can I use pumpkin seeds or other home remedies?**
No. Home remedies are not reliable for killing intestinal worms, and they can delay proper treatment. While some natural substances are studied for parasite control, none are proven to work safely and completely in dogs. Your dog needs a veterinary deworming product at the correct dose. If you prefer a natural approach, discuss it with your veterinarian, who can tell you whether it is safe to combine with medical treatment.

**Will my dog need to be hospitalized?**
Most dogs do not need hospitalization. Mild to moderate worm infections are treated at home with oral medication. Hospitalization is only needed if your dog is severely dehydrated, has a heavy worm burden, or has another illness at the same time. Signs that require urgent care include repeated vomiting, inability to keep water down, pale gums, collapse, or blood in the stool. If you see these, seek emergency care immediately.

**How often should I deworm my dog after this?**
That depends on your dog's age, lifestyle, and local parasite risks. Puppies need more frequent deworming than adult dogs. Dogs that hunt, visit dog parks, or live in areas with high parasite pressure may need monthly prevention. Your veterinarian can set a schedule based on your dog's specific situation. Annual stool checks are a good baseline for most adult dogs.

## Related Clinical & Scientific Guides

* [Cat Straining to Poop but Only Passing Mucus: Causes and Care](/knowledge/veterinary-medicine/digestive-and-urinary-care/cat-straining-poop-mucus)
* [Cat Upset Stomach: Home Remedies That Are Safe](/knowledge/veterinary-medicine/digestive-and-urinary-care/cat-upset-stomach-home-remedies)
* [Cat Straining to Poop but Nothing Comes Out: Emergency or Not?](/knowledge/veterinary-medicine/digestive-and-urinary-care/cat-straining-to-poop-nothing-comes-out)


## References and Further Reading

- [MSD Veterinary Manual Digestive Disorders of Dogs and Cats](https://www.msdvetmanual.com/dog-owners/digestive-disorders-of-dogs)
- [AVMA Pet Owner Resources](https://www.avma.org/resources-tools/pet-owners)
- [MSD Veterinary Manual Pet Owner Version](https://www.msdvetmanual.com/pet-owners)
- [AAHA Pet Owner Resources](https://www.aaha.org/for-pet-parents/)

## Related Articles

- [Dog Diarrhea with Blood and Mucus: What It Means and What to Do](/knowledge/veterinary-medicine/digestive-and-urinary-care/dog-diarrhea-blood-mucus-causes)
- [Dog Dehydration Symptoms: How to Tell and What to Do](/knowledge/veterinary-medicine/digestive-and-urinary-care/dog-dehydration-symptoms-how-to-tell)
- [Dog Not Eating: When to Worry and What to Do](/knowledge/veterinary-medicine/digestive-and-urinary-care/dog-not-eating-when-to-worry)
- [Dog UTI Symptoms: How to Recognize and What to Do](/knowledge/veterinary-medicine/digestive-and-urinary-care/dog-uti-symptoms-how-to-recognize)
- [Dog Diarrhea for 3 Days: When to Call the Vet](/knowledge/veterinary-medicine/digestive-and-urinary-care/dog-diarrhea-3-days)

> This article is general educational information for pet owners. It is not a substitute for veterinary diagnosis, examination, or treatment. If your pet is showing severe or rapidly worsening signs, contact an emergency veterinary hospital immediately.