What Can I Give My Dog for Worms? Safe Deworming Options
By Dr. Zubair Khalid, DVM, MS, PhD ·
What can I give my dog for worms? The right answer depends on which worm your dog has, because roundworms, tapeworms, hookworms, and heartworms each need a different drug. Your veterinarian can identify the worm and pick a safe, effective dewormer for your dog's weight and health. This article is educational and is not a substitute for veterinary diagnosis or treatment.
Quick Answer
- Never give your dog dewormers made for people or for livestock. Some human products and farm animal drugs can seriously harm dogs.
- Most dog dewormers are prescription or vet-recommended products. Your vet matches the drug to the worm and calculates the dose from your dog's weight [1].
- Praziquantel is the standard treatment for tapeworms, and it is also used in large-scale dog deworming programs [2].
- Monthly heartworm preventives often also treat roundworms and hookworms, so one product can cover several parasites.
- If you see worms in stool or your dog has vomiting, diarrhea, or weight loss, call your vet before giving anything at home.
What Does "Worms" Mean in Dogs?
"Worms" is a casual word for intestinal parasites and heartworms. The main types in dogs are roundworms, hookworms, tapeworms, and whipworms. Heartworms are different because they live in the heart and lungs, not the gut.
These infections are common. In one study of 120 dog fecal samples, 35% tested positive for parasitic infections, with hookworm (Ancylostoma) found most often [3]. Another study of stray dogs found that 37.2% had at least one type of parasite, and hookworm was the most common single infection [4].
Some of these worms can pass to people. That is why dog deworming is treated as a public health measure as well as a pet health measure [2][5].
Signs Your Dog May Have Worms
Many dogs with worms look normal at first. Others show clear signs. Watch for:
- Worms that look like spaghetti or rice grains in stool or around the rear end
- Vomiting, sometimes with worms in the vomit
- Diarrhea or soft stool (dogs with very soft or soft stools had higher parasite positivity in one study) [3]
- A potbellied look, especially in puppies
- Weight loss despite a normal appetite
- Dull coat, low energy, or poor growth in young dogs
- Scooting or itching around the rear end (common with tapeworms)
- Coughing or trouble breathing (this can point to heartworms)
If you are trying to figure out whether your dog has worms at all, these guides walk through the signs step by step: How Do I Know If My Dog's Got Worms and How To Tell If Dog Has Worms.
Causes and Risk Factors
Dogs pick up worms in several ways.
- Roundworms: puppies can get them from their mother before birth or through nursing. Dogs also get them by swallowing eggs from soil.
- Hookworms: larvae can enter through the skin or be swallowed. They are a leading parasite in many dog populations [3][4].
- Tapeworms: dogs get them by eating fleas or eating raw meat or rodents that carry the parasite.
- Heartworms: mosquitoes spread these. An infected mosquito bites your dog, and the larvae grow into adult worms over months.
Risk goes up for puppies, dogs that visit dog parks or kennels, dogs that eat things off the ground, and dogs that live in warm, humid areas where mosquitoes thrive. Dogs in close contact with people in areas with poor sanitation also play a role in spreading some parasites [5].
How Veterinarians Diagnose Worms
Your vet will ask about your dog's history, signs, and lifestyle. Then they will test.
- Fecal flotation: a stool sample is mixed with a solution so parasite eggs float and can be seen under a microscope. Different solutions can give different results, so a negative test does not always rule out worms [3].
- Fecal antigen testing: this looks for proteins from the parasite and is used in large deworming programs [2].
- Heartworm antigen test: a blood test checks for adult heartworm infection.
- Visual exam: if you bring in a worm you found, your vet can often identify the type right away.
Because different worms need different drugs, diagnosis matters. Giving the wrong dewormer wastes money and leaves your dog infected.
What Can I Give My Dog for Worms? Treatment Options
This is the part where owners most often get into trouble. The safe rule is simple: use a product your veterinarian recommends for the specific worm, and let your vet set the dose.
Dog Medicine for Worms: What Vets Use
Several drug classes treat worms in dogs. Each targets certain parasites.
| Worm type | Common drug options | Notes |
|---|---|---|
| Roundworms | Pyrantel, fenbendazole, milbemycin oxime | Often included in monthly preventives |
| Hookworms | Pyrantel, fenbendazole, milbemycin oxime | Hookworm is the most common finding in many studies [3][4] |
| Tapeworms | Praziquantel | Standard tapeworm treatment, also used in mass dog deworming [2] |
| Heartworms | Monthly preventives (prevention) | Treatment of adult heartworms is a vet procedure |
| Multiple worms | Combination products | One product can cover several parasites |
Most dewormers have wide safety margins, meaning the dose that causes problems is much higher than the dose used for treatment [1]. That does not make them safe to guess with. Puppies, pregnant dogs, and dogs with liver or kidney disease need extra care.
What Can I Give My Dog for Tapeworms?
Praziquantel is the go-to drug for tapeworms in dogs [2]. It is available in prescription products and in some over-the-counter options, but the dose still depends on your dog's weight. Tapeworms come from fleas, so treating the worms without controlling fleas usually means the tapeworms come back.
What Can I Give My Dog for Heartworms?
You cannot safely treat adult heartworms at home. Heartworm prevention is given monthly, and the drugs used for prevention are different from the drugs used to kill adult worms. Adult heartworm treatment is a veterinary procedure with strict rest requirements. If your dog tests positive, your vet will build a treatment plan.
What Can I Give My Dog for Parasites That Are Not Worms?
Some dog parasites are not worms at all. Coccidia, giardia, and fleas are examples. They need different drugs. Dewormers will not fix them. If your dog has diarrhea that does not clear up, ask your vet to test for these too.
Safety Warnings About Human and Farm Products
Do not give your dog dewormers made for people. Doses and ingredients are not the same, and some can be toxic to dogs. Do not use livestock dewormers either. The widespread, indiscriminate use of antiparasitic drugs has already led to drug resistance in parasites of farm animals, and careless use in dogs can cause the same problem [6].
A few drugs are known to be safe even in breeds with the MDR1 (ivermectin sensitivity) gene. Selamectin was tested in dogs and cats at 10 times the recommended dose with no adverse reactions, and milbemycin oxime is well tolerated in dogs, including Collies [1]. These macrocyclic lactones do not cross the blood-brain barrier [1]. This is useful to know if your dog is a Collie or a related breed, but it does not mean you should choose a product on your own.
Recovery, Outlook, and Long-Term Management
Most dogs respond well to the right dewormer. You may see worms in the stool after treatment, which is normal. Some dogs need a second dose in two to three weeks to catch worms that were in the larval stage during the first treatment.
Follow-up testing matters. A negative fecal test after treatment confirms the worms are gone. If signs continue, your vet may need to test for other parasites or check for reinfection.
Long-term, the goal is prevention, not repeated treatment. Repeated deworming without prevention is how resistance develops [6].
Prevention
Prevention is easier than treatment. A few habits make a big difference.
- Give a monthly heartworm preventive year round, or as your vet advises for your region.
- Use a broad-spectrum dewormer on the schedule your vet recommends. Puppies usually need more frequent deworming than adults.
- Control fleas, because fleas carry tapeworms.
- Pick up dog waste right away and wash your hands after.
- Keep your dog away from dead animals and raw meat that could carry tapeworms.
- Ask your vet about testing at least once a year, even if your dog seems fine.
If you are unsure whether your dog has worms, these guides can help you sort out the signs: How To Know If Dogs Got Worms and How To Tell If Dog Has A Worm.
Limitations and When to Contact a Veterinarian
No article can tell you which worm your dog has or what dose is safe. Individual cases need a veterinarian who can examine your dog, test a stool or blood sample, and weigh your dog.
Call your vet the same day if your dog:
- Has repeated vomiting or diarrhea
- Is a puppy with a potbelly, poor growth, or low energy
- Has blood in the stool
- Has worms visible in stool or vomit
- Is coughing or breathing harder than usual
Go to an emergency clinic now if your dog:
- Collapses or has trouble standing
- Breathes with obvious effort or gums look pale or blue
- Has severe, nonstop vomiting or diarrhea
- Has a swollen, painful belly
Call a poison control hotline right away if your dog ate a dewormer meant for a person or a farm animal, or ate too much of any dewormer. Bring the package with you so the vet knows what was given.
Schedule a routine visit if your dog seems well but you found a worm, if a fecal test was positive, or if it is time for a monthly preventive.
Frequently Asked Questions
Can I buy dog dewormer without a prescription?
Some dewormers are sold over the counter, but that does not mean they fit your dog's situation. The drug has to match the worm, and the dose has to match your dog's weight. Your vet can tell you which product is right and whether a prescription version is safer.
How do I know which worm my dog has?
You usually cannot tell just by looking. A fecal test under a microscope or an antigen test identifies the parasite. If you find a worm, put it in a sealed bag and bring it to your vet for identification.
Can my dog give worms to me or my family?
Yes, some dog worms can infect people. Roundworms and hookworms are the main concerns, and children are at higher risk. Picking up waste promptly, washing hands, and keeping up with deworming lower the risk [5][3].
Do I need to treat my dog again after the first dose?
Often yes. Many dewormers kill adult worms but not all developing stages. Your vet may recommend a repeat dose in two to three weeks, plus a follow-up fecal test to confirm the worms are gone.
Are dewormers safe for puppies and pregnant dogs?
Many dewormers are used in puppies and pregnant dogs, but the product and timing matter. Puppies are often dewormed on a set schedule starting at a young age. Let your vet choose the product and dose for puppies, pregnant dogs, and dogs with other health problems.
Related Articles
- How Do I Know If My Dog's Got Worms
- How Do I Know If My Dog Has Worm
- How To Know If Dogs Got Worms
- How To Tell If Dog Has A Worm
- How To Tell If Dog Has Worms
- What Can I Give My Dog For Diarrhea At Home
References
- Safety of Anthelmintics in Animals - Pharmacology. Merck Veterinary Manual.
- Dog deworming by smart collar: a 24-month field evaluation from a One Health prospective, randomized, double masked trial. Science in One Health, 2025.
- Percent positivity and risk analysis of zoonotic intestinal parasites (helminths) in dogs population- a participatory epidemiological study. Veterinary parasitology, regional studies and reports, 2026.
- Prevalence of intestinal helminth parasites in stray dogs euthanized at the canine control Center in the Miguel Hidalgo Neighborhood of the Tlahuac District in Mexico City. Veterinary parasitology, regional studies and reports, 2026.
- Hookworm and Strongyloides stercoralis infections in school-age children and cohabiting dogs in Cambodia following 5 years of bi-annual mass drug administration: a cross-sectional observational study. The Lancet. Global health, 2026.
- Anthelmintic Drugs for Animals - Pharmacology. Merck Veterinary Manual.