December 5, 2025
by Belle Isle

Understanding Diarrhea in Pets: When to Worry and How to Help

At Belle Isle Animal Hospital, we see cases of diarrhea in pets almost every day. While some episodes are mild, others can indicate deeper health issues. Understanding the signs and knowing when to seek care can make a meaningful difference in your pet’s wellbeing.

How to Gauge the Severity

Not all diarrhea is the same. Here are general guidelines:

  • Soft stool
  • Often mild and may resolve with rest and gentle home care.
  • Liquid stool
  • More concerning and should be monitored closely.
  • Liquid stool with visible blood
  • Should be evaluated by a veterinarian soon.
  • Very dark, tarry stool or stool resembling coffee grounds
  • Possible internal bleeding. This is an emergency and requires immediate veterinary care.

If diarrhea lasts longer than two days, or if your pet also has vomiting, refuses food, or seems sluggish, they should be seen right away.

Why Diarrhea Can Be Serious

Even a short episode can lead to dehydration or loss of important electrolytes. Pets who are small, senior, or already dealing with illness can decline quickly, so prompt attention is important.

What Causes Diarrhea

Diarrhea can be triggered by a wide range of issues, including:

  • Eating unusual foods or objects
  • Ingesting toxins
  • Switching foods too quickly
  • Stress
  • Food allergies or sensitivities
  • Parasites such as giardia or roundworms
  • Medical conditions including pancreatitis or endocrine disorders

Your veterinarian may recommend X rays, blood testing, or fecal testing to help determine the cause.

Treatment Approaches

Treatment varies depending on the severity of symptoms and what we suspect is causing the issue.

Mild to moderate cases

These may respond well to:

  • Deworming
  • Bland diets
  • Probiotics
  • Pet safe anti diarrhea medications

Moderate to severe cases

These may require:

  • GI focused antibiotics
  • Fluid therapy
  • Nausea medications
  • Appetite support
  • Medications that calm and protect the GI tract

Home Tips for Preventing Digestive Upset

Introduce new foods slowly

A gradual transition over one week reduces the risk of diarrhea.

Choose high quality diets

We recommend veterinary nutritionist formulated foods such as Hill’s Science Diet, Purina Pro Plan, Royal Canin, and Eukanuba.

Avoid table food

Rich holiday foods, dairy, and processed foods can cause inflammation, vomiting, and diarrhea.

Never give human medications

Medications designed for people can be unsafe for pets and should only be given under veterinary guidance.

Call Belle Isle When Your Pet Needs Care

Diarrhea may seem simple, but it can quickly progress. If you are unsure whether your pet needs to be seen, it is always better to reach out.

If your pet has diarrhea or is showing additional symptoms, Call Belle Isle Animal Hospital or request an appointment online. Our team is here to support your pet’s health every step of the way.