Diarrhea in Dogs

What are the different types of diarrhea?

In veterinary medicine, various forms of diarrhea are distinguished. In cases of small-intestinal diarrhea, the stool is usually very watery, with large volumes being passed, while the frequency of bowel movements often remains normal. The high fluid loss can quickly lead to dehydration and electrolyte imbalance, especially if the dog is also vomiting or has reduced food intake.
In cases of large intestine diarrhea, the stool is typically soft to mucous-like; the dog passes small amounts very frequently and often strains heavily. Occasional fresh, bright red blood in the stool is typical. In some cases, a mixed form may occur, exhibiting signs of both types of diarrhea.

Causes

Dogs' digestive systems are more sensitive than many people realize. Common causes of diarrhea, with or without vomiting, include:

• Inappropriate or unfamiliar food: for example, switching diets without a gradual transition, table scraps, unsuitable food, or spoiled food; or picking something up while out on a walk
• Food intolerance/allergy
• Ingestion of foreign objects or toxins
• Infections: Viruses, bacteria, and parasites (puppies and young dogs are particularly susceptible to parasitic infections)
• Inflammation / Autoimmune Diseases
• Tumors
• Extragastrointestinal causes such as kidney disease, liver disease, pancreatitis, or hormonal disorders such as Addison's disease
• Stress: Just as in humans, stress can lead to increased bowel movements

It is not always easy to pinpoint the exact cause. Especially in cases of recurring or chronic symptoms, the diagnostic process is a step-by-step one and may require several tests.

Bloody diarrhea—how dangerous is it?

Blood in the stool is always a warning sign, but not necessarily an emergency. What matters is what the blood looks like and how the dog is doing overall. A small amount of fresh, bright red blood, often mixed with mucus, is more likely to indicate inflammation of the large intestine and does not necessarily require immediate veterinary attention. Large amounts of blood or very dark or black stool may indicate bleeding in the upper gastrointestinal tract and should always be evaluated by a veterinarian as soon as possible.

Warning Signs: When Should I Definitely See a Veterinarian?

• if your dog is very lethargic or weak
• for stomach pain
• if there is a large amount of blood in the stool or vomit, or if the stool is very dark or black
• If you've seen or suspect that your dog has ingested something poisonous
• for puppies or very old dogs, for very small dogs, or for chronically ill animals

Not sure if you need to see a vet right away? Calingo customers have free access to our telemedicine service. Your questions will be answered 24/7 by veterinary professionals, all from the comfort of your own home.

Diagnosis and Treatment

Based on a discussion with you and a thorough clinical examination, the veterinarian will first assess whether the diarrhea is uncomplicated or complicated. In cases of uncomplicated diarrhea, the dog’s general condition is usually only slightly affected or not at all; the dog has an appetite and otherwise appears lively.
In complicated cases, the dog is significantly affected, eats poorly or not at all, and loses so much fluid that it cannot be replenished through drinking and food. Severe bloody diarrhea, puppies, or very small dogs also fall into the category of complicated cases.

Depending on the situation, blood and stool tests may be necessary, and sometimes imaging procedures such as ultrasound, X-rays, or endoscopies may also be required.

Treatment always depends on the cause and can range from a bland diet to medication and intravenous fluids.

Home remedies: what works

If you have mild diarrhea and are feeling generally well, a bland diet for a few days can be very helpful. This includes easily digestible foods such as skinless, steamed chicken breast, rice cooked until very soft and mushy, or some cottage cheese. The well-known carrot soup can also be helpful, but should not be the only thing you eat.

Completely withholding food for 24 hours is not really recommended for diarrhea without vomiting, as the gut bacteria need energy to regenerate. Probiotics for animals and fiber (soaked psyllium husks or cellulose) can also help. You should never give your dog medications intended for humans, as many of them are dangerous or even toxic to dogs.

Can diarrhea and vomiting be prevented?

Not always, but there's a lot you can do:

• Gradual feed transitions (over 7–10 days)
• no food scraps on the table
• Regular deworming or fecal examinations for parasites
• full vaccination coverage
• Keep poisonous plants out of reach or dispose of them immediately
• Secure the trash
• low-stress environment

Conclusion

Diarrhea is not a disease in itself, but a symptom of an underlying condition. It is often harmless, but can sometimes be serious. It is always crucial to consider the dog as a whole and to notice any changes early on. If you’re unsure, the veterinary rule of thumb is: it’s better to see a vet once too soon than once too late.

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