Salmonella in Dogs: Symptoms and Signs to Watch For

Name: Salmonella in Dogs: Symptoms and Signs to Watch For
Creator: Dr. Zubair Khalid

By Dr. Zubair Khalid, DVM, MS, PhD · 2026-10-02

Salmonella in dogs symptoms usually start with vomiting and diarrhea, sometimes with blood, and can progress to fever, lethargy, and dehydration. Some dogs carry the bacteria without any signs at all, while others become seriously ill within days of exposure. Knowing which signs matter most helps you decide how fast to act.

This article is educational and is not a substitute for veterinary diagnosis or treatment.

Quick Answer

The most common early signs are vomiting and diarrhea, often watery or bloody, sometimes with mucus [1][2].
Lethargy and loss of appetite often appear alongside the gut signs, and a fever may or may not be present [1][2].
Dehydration develops quickly with repeated vomiting or diarrhea, especially in puppies, seniors, and dogs already ill [2].
Salmonella can spread to people, so wash your hands after handling a sick dog, its stool, or its food bowl [1][3].
Any dog with bloody diarrhea, repeated vomiting, or a fever needs to be seen by a veterinarian the same day.

What Salmonella Infection Looks Like in Dogs

Salmonellosis is an infection with Salmonella bacteria. It affects most animal species, including dogs and humans, and it is a major public health concern [1]. The illness can look very different from one dog to the next. Some dogs show a healthy carrier state with no signs at all, some develop acute or chronic enteritis (gut inflammation), and some progress to septicemia, which means the bacteria enter the bloodstream [1].

Mild Signs

A mild case may look like a simple stomach upset. You might see one or two episodes of vomiting, soft stool, a slightly reduced appetite, and a dog that seems a bit quieter than usual. These signs can be easy to dismiss, especially if your dog ate something unusual or has a sensitive stomach.

Moderate Signs

As the infection continues, vomiting and diarrhea become more frequent. The stool may turn watery, contain mucus, or show streaks of blood. Your dog may stop eating, drink less, and start to look tired. Dehydration can set in, and you may notice tacky gums, sunken eyes, or skin that stays tented when you gently pinch it.

Severe Signs

In serious cases, the bacteria spread beyond the gut. A dog may run a fever, become weak or wobbly, vomit repeatedly, and pass large amounts of bloody diarrhea. Septicemia is the most dangerous form, and it requires aggressive treatment [1]. Puppies, senior dogs, pregnant dogs, and dogs with other health problems tend to decline faster.

A documented outbreak in a Rottweiler kennel linked to a raw meat-based diet showed vomiting, diarrhea, lethargy, and dehydration without fever, and the illness was worse in dogs that had recently given birth [2]. That case is a good reminder that fever is not always part of the picture.

Salmonella in Dogs Symptoms: What to Watch For

The signs below are the ones owners most often notice. Keep track of when each one started and how often it happens. That timeline helps your veterinarian decide how urgent the case is.

Vomiting

Dog Salmonella vomiting is often one of the first signs. It may start as occasional and become more frequent over a day or two. Vomiting that happens more than a few times in a day, or that continues past 24 hours, is a reason to call your vet.

Diarrhea

Diarrhea may be soft at first and then become watery. Blood or mucus in the stool is a red flag. If your dog has bloody diarrhea, treat it as urgent. Several serious gut diseases in dogs look similar, including parvovirus and hemorrhagic gastroenteritis, so a veterinarian needs to sort out the cause.

Fever

Salmonella dog fever is possible but not guaranteed. Some dogs run a high temperature, and some stay normal or even low [2]. You cannot reliably tell by touch. A rectal temperature taken at the clinic is the only accurate way to know.

Lethargy

Salmonella dog lethargy often shows up as a dog that sleeps more, ignores toys, or does not greet you at the door. In young puppies, lethargy can be the first clue that something is wrong, before the gut signs become obvious.

Dehydration and Other Signs

Repeated fluid loss leads to dehydration. Watch for dry gums, loss of skin elasticity, and reduced urine output. Some dogs also have abdominal pain, which may show as pacing, panting, or refusing to lie down comfortably.

If your dog has gut signs along with urinary changes, it helps to know what a urinary problem looks like so you can describe the whole picture to your vet. See Signs Of Uti In Dogs and Dog Uti Symptoms for comparison.

Main Causes and How Dogs Get Salmonella

Dogs usually get Salmonella by eating contaminated food or by contact with infected stool, contaminated surfaces, or infected animals [1]. Raw meat-based diets are a well-documented source. Surveillance data from Great Britain showed that Salmonella isolations from raw meat pet food rose sharply over a decade, from 4 isolates of 4 serovars in 2013 to 606 isolates of 39 serovars in 2022, alongside a five-fold increase in the number of raw pet food plants [4]. The same dataset found considerable overlap in the types of Salmonella found in raw pet food and in dogs [4].

Households with several animals can also be a factor in human infection. A 2024 household outbreak of Salmonella Thompson in Italy involved an infant and the family's companion animals, and whole-genome sequencing confirmed that the human and animal strains were genetically related [3].

Cause	Typical clues	How urgent
Raw or undercooked meat, including raw pet food	Recent diet change or ongoing raw feeding, multiple pets affected	Call your vet, isolate the food, and stop feeding it
Contaminated stool or environment	Dog eats stool, kennel or shelter setting, several dogs sick	Same-day vet visit if signs are moderate or worse
Contact with an infected animal or person	New dog in the home, recent boarding, sick family member	Same-day vet visit
Scavenging spoiled food or garbage	Sudden vomiting after a raid on the trash	Call your vet, watch closely for 24 hours
Carrier state with no clear exposure	Mild or no signs, positive stool test	Routine visit to discuss testing and shedding

Red Flags That Mean Emergency Care

Some signs mean you should stop reading and call an emergency clinic now.

Bloody diarrhea, especially large amounts or repeated episodes
Vomiting that will not stop, or vomiting with a bloated or painful belly
A puppy under 6 months old with vomiting, diarrhea, or lethargy
Collapse, weakness, wobbling, or a dog that cannot stand
Pale gums, cold ears, or a body temperature that feels very low
Seizures, confusion, or any change in consciousness
No urine for 12 hours or more
Signs that keep getting worse despite home care

Puppies with severe gut disease can deteriorate fast. A case report of a 5-month-old puppy with parvoviral hemorrhagic gastroenteritis described a puppy that was normally alert and playful, then became suddenly lethargic and depressed 3 days before admission, followed by loss of appetite, vomiting, and diarrhea, and later bloody, projectile, foul-smelling diarrhea [5]. The early pattern of lethargy before gut signs is common in serious intestinal infections, including salmonellosis.

Safe Things You Can Do at Home While You Wait

Home care does not replace veterinary care, but a few steps can keep your dog more comfortable and protect your household.

Offer Small Amounts of Water

Dehydration is the biggest risk with vomiting and diarrhea. Offer small, frequent amounts of fresh water instead of a large bowl at once. If your dog cannot keep water down, that is a reason to call the vet right away.

Withhold Food Briefly, Then Reintroduce Bland Food

A short fast of a few hours can let an upset stomach settle. After that, offer small portions of a bland, low-fat meal. If your dog vomits again, stop and call your vet.

Do Not Give Human Medications

Never give human anti-diarrheal or anti-nausea drugs without veterinary guidance. Some are toxic to dogs, and others can mask signs that your vet needs to see.

Protect Yourself and Your Family

Salmonella is zoonotic, meaning it can pass from animals to people [1]. Wear gloves when cleaning up stool or vomit, wash your hands thoroughly afterward, and disinfect bowls, floors, and bedding. Keep sick dogs away from young children, elderly family members, and anyone with a weakened immune system.

Isolate and Track

Keep your dog away from other pets in the home. Write down the time of each vomiting or diarrhea episode, what the stool looked like, and whether your dog ate or drank. This log is genuinely useful at the clinic.

What Your Veterinarian Will Check and Test

Your vet will start with a full history and physical exam. They will check hydration, gum color, abdominal pain, and body temperature. They will also ask about diet, especially any raw meat, recent boarding, travel, or contact with other animals.

Diagnosis of salmonellosis is confirmed by isolating the bacteria [1]. That usually means a stool culture, and sometimes a blood culture if septicemia is suspected. Your vet may also run blood work to check organ function and electrolyte levels, and imaging if they suspect a blockage or another cause.

Treatment depends on how sick your dog is. Supportive care, including fluids and electrolytes, is the backbone of treatment. Antimicrobials are required in patients with signs of systemic disease, but their use is controversial because they may increase the risk of a dog becoming a chronic shedder [1]. That is why your vet will decide whether antibiotics are appropriate for your dog, and they will calculate any dose based on your dog's weight and health.

Probiotics are an area of active research. A canine-derived Lactiplantibacillus plantarum strain showed strong preventive effects against salmonellosis in a mouse model, and the researchers proposed it as a possible alternative to antibiotics given concerns about antimicrobial resistance and disruption of gut bacteria [6]. This is promising but not yet a standard treatment, so ask your vet before starting any supplement.

If your dog has a fever along with ear or skin problems, some of those signs overlap with other conditions. See Dog Ear Infection with Fever: Emergency Signs to Watch For for guidance on when fever plus ear pain needs urgent care.

Prevention and Monitoring

Prevention comes down to food safety and hygiene.

Avoid raw meat-based diets, especially for puppies, seniors, pregnant dogs, and dogs on immunosuppressive medication.
Cook meat thoroughly and store pet food properly.
Wash bowls, utensils, and food prep surfaces after every use.
Pick up stool promptly and dispose of it safely.
Wash your hands after handling pets, food, or waste.
Keep dogs away from garbage, spoiled food, and dead animals.
If one pet is diagnosed, monitor the others for vomiting, diarrhea, or lethargy.

If you feed a raw diet and your dog develops gut signs, tell your vet about the diet at the first visit. That detail can shorten the path to a diagnosis.

Parasites can cause similar gut signs, so it helps to know the difference. See What Are The Signs And Symptoms Of A Dog With Worms and Signs Of Worms In A Dog for comparison.

Limitations and When to Contact a Veterinarian

No article can tell you what is happening in your individual dog. Only a veterinarian who examines your dog can diagnose salmonellosis or rule out other causes. Use the timing below as a guide.

Emergency now: bloody diarrhea, uncontrolled vomiting, collapse, weakness, seizures, pale gums, a puppy under 6 months with gut signs, or a dog that cannot keep water down.

Same day: repeated vomiting or diarrhea for more than 12 to 24 hours, fever, marked lethargy, refusal to eat, or signs that are clearly getting worse.

Routine visit: mild, intermittent soft stool with a dog that is otherwise bright and eating, or a dog that had known exposure to contaminated food but seems well.

Frequently Asked Questions

Can a dog have Salmonella without any symptoms?

Yes. Some dogs are healthy chronic carriers and shed the bacteria in their stool without ever looking sick [1]. These dogs can still pass the infection to other animals and to people, which is why hygiene matters even when your dog seems fine.

How long after exposure do signs appear?

Signs usually appear within a few days of eating contaminated food or contact with infected material. In the kennel outbreak linked to raw meat, affected dogs showed vomiting, diarrhea, lethargy, and dehydration, and the illness was worse in dogs that had recently given birth [2]. If your dog was exposed and looks normal after several days, watch for another week and mention the exposure at your next vet visit.

Is Salmonella in dogs contagious to people?

Yes. Salmonellosis is a zoonotic disease, meaning it spreads between animals and humans [1]. A household outbreak in Italy confirmed genetically related strains in an infant and the family's pets [3]. Wash your hands after any contact with a sick dog, its stool, or its food, and keep young children and immunocompromised people away from contaminated areas.

Should I give my dog antibiotics for Salmonella?

No, not without veterinary guidance. Antibiotics are needed for dogs with systemic disease, but their use is controversial because they may increase the chance of a dog becoming a chronic shedder [1]. Your veterinarian will decide whether antibiotics are right for your dog and will calculate the dose based on your dog's weight and health.

Can probiotics help a dog with Salmonella?

Probiotics are being studied as a possible alternative to antibiotics for salmonellosis, and a canine-derived Lactiplantibacillus plantarum strain showed strong preventive effects in a mouse model [6]. That research is early, and it does not replace veterinary treatment for a sick dog. Ask your vet before adding any supplement to your dog's routine.

References

Salmonellosis in Animals - Digestive System. Merck Veterinary Manual.
Salmonellosis Outbreak in a Rottweiler Kennel Associated with Raw Meat-Based Diets. Animals : an open access journal from MDPI, 2025.
One Health Investigation of a Household Salmonella Thompson Outbreak in Italy: Genomic and Epidemiological Characterization of an Emerging Serotype. Pathogens (Basel, Switzerland), 2025.
Salmonella surveillance in raw pet food and dogs in Great Britain, 2013-2022. Frontiers in veterinary science, 2026.
Parvoviral hemorrhagic gastroenteritis and its therapeutic intervention in a case of 5-month-old puppy. Companion animal health and genetics, 2026.
Isolation and Identification of a Canine-Derived Lactic Acid Bacterium with Probiotic Potential for Salmonellosis Prevention and Treatment. Probiotics and antimicrobial proteins, 2026.