Get

In Your Inbox

Dogster is reader-supported. When you buy via links on our site, we may earn an affiliate commission at no cost to you. Learn more.

How Long to Withhold Food From a Dog With Diarrhea: Vet-Approved Guide

Share

a border collie dog looking sick covered with blanket on couch

If your dog has diarrhea, how should you prevent it from worsening? You may have heard that you should withhold food from your dog if they’re experiencing diarrhea, and this recommendation is an excellent start for relieving your dog’s discomfort. If your dog has diarrhea, having them fast for 12 to 24 hours can certainly help the GI tract settle. Whether your dog needs more treatment than fasting will be determined by what’s causing your dog’s diarrhea.

Causes of Diarrhea in Dogs

Dogs explore the world with their mouths, which can unintentionally ingest toxic substances. Dietary indiscretion, or “garbage toxicosis,” as vets call it, is toxicity from eating garbage. Whether it’s actual garbage or some other non-edible substance, it’s dogs’ most common source of diarrhea.

Another common cause of diarrhea in dogs is a diet change. If you’ve recently changed your dog’s food, you’ll want to give your dog’s stomach a few days to adapt to the new food composition. Vets recommend slowly introducing your dog’s new food by mixing it with their old food, but this isn’t always possible when you run out unexpectedly. Dogs are also susceptible to food intolerances and allergies.

Parasites such as tapeworms, roundworms, hookworms, whipworms, coccidia, and giardia can all cause gastrointestinal distress and diarrhea. Parvovirus, distemper, and coronavirus are all viral culprits in diarrhea, while Salmonella is a common bacterial infection that causes diarrhea.

Sick mastiff dog sitting on table in a vet clinic
Image Credit: UfaBizPhoto, Shutterstock

How to Fast Your Dog

When you fast your dog, you want to do it correctly. You should first ascertain whether your dog has an infection or parasites and should have them seen by a vet to run fecal tests and possibly blood work, depending on the severity of the condition. These causes mentioned above will not clear up from fasting alone, and diarrhea will continue until the disease has been cleared from the body, often with the help of medication.

You’ll want to fast your dog for 12 hours. A dog’s digestion cycle is about 10 hours. So, giving your dog’s digestive tract at least 12 hours to clear itself out can help relieve your dog of their diarrhea.

Make sure you give your dog water while you fast them. Diarrhea can cause severe, sometimes life-threatening, dehydration. If your vet recommends it, you can also offer your dog unflavored Pedialyte to maintain good electrolyte levels.

If you’re concerned about your pet’s well-being, we recommend you contact a veterinarian.

If you need to speak with a vet but can't get to one, head over to PangoVet. It's our online service where you can talk to a vet online and get the advice you need for your pet — all at an affordable price!

PangoVet_Mention-in-Content Savings V1

divider dog paws 2 oct 2024

Final Thoughts

It can be hard to see your dog going through something painful. Luckily, fasting your dog is an effective first step for many cases of diarrhea, specifically those caused by garbage, gut issues, or a change in food routines.

See Also: 


Featured Image Credit: Lindsay Helms, Shutterstock

Want content like this delivered to you?

Sign Up For Our Newsletter

News, insights, expert advice, and everything dog

* By submitting, you agree to our Terms & Conditions and Privacy & Cookies Policy.




How useful was this post?

Click on a star to rate (you can leave written feedback after clicking submit)

Help us improve Dogster for pet parents!

Your feedback really matters.

What did you like about this post? Also how can we improve it?

Join the conversation

Leave a Reply

You’re very welcome to leave a comment or question. Please know that all comments must meet our community guidelines, and your email address will NOT be published. Let’s have a positive and constructive conversation.


Dogster's Digital Magazine is Back!​

Dogster Magazine Cover June 2026

Vet-approved health & behavior advice

Real dog stories & community features

The Organization Helping Pets Feel Safer, Happier, and ‘Fear Free’ – Heroes of the Pet World

For many pet owners, stress during veterinary visits, grooming appointments, travel, or even routine handling can feel like an unavoidable part of life...

Why Some Dogs Treat Mealtime Like Playtime – And When to Pay Attention

Most dogs are reliable eaters. Bowl goes down, food disappears. So when a dog starts batting kibble across the kitchen floor, tossing pieces...

Major Win for Dogs: Ontario Becomes the Final Province to Ban Ear Cropping and Debarking

​​Ontario has approved new animal welfare regulations that will prohibit elective ear cropping and devocalization (debarking) procedures in dogs from January 1, 2027....

Dogster’s Weekly Photo Contest Winners: Most Adorable Puppy (June 8, 2026)

Every week our team gets the privilege of sorting through our readers photos to choose what dogs will win this weeks contest! See...

More related

Why Do Dogs Like Mud? 10 Interesting & Vet-Verified Reasons

If you are a dog owner, you have likely experienced the joy of watching your furry friend jump around in a muddy puddle....

I Adopted a Dog With Separation Anxiety: 15 Vet-Approved Care Tips

Separation anxiety is anxiety caused when dogs are separated from their owners. Typical signs include destructive behaviors, toileting accidents and other unwanted behaviors...

Does a Dog’s Breed Determine Their Behavior? Genetic Science vs. Stereotypes

Choosing the perfect dog can be difficult. Everyone has a different situation, and each situation will benefit certain dogs better than others. This...

Bernedoodle (Bernese Mountain Dog & Poodle Mix): Info, Pictures, Care & More

The Bernedoodle is a cross between the intelligent Poodle and the gentle giant, the Bernese Mountain Dog. Owners say that the hybrid adopts...

Keep reading

Can Dogs Eat Dairy? Vet-Verified Nutritional Guide & FAQ

If your dog has ever expressed interest in sharing your bowl of ice cream or glass of milk, you know how tough it can be to say “no” to them. But is sharing dairy products with your dog safe? Unfortunately,...

Can Dogs Eat Dairy

Inception Dog Food Review 2026: Recalls, Pros & Cons

Review Summary Inception Pet foods is a brand that produces wet and dry food for cats and dogs with animal or fish protein as the first two ingredients in each recipe. Inception is owned by Pets Global, which is based...

Dogster_Inception Dog Food Review

Can Dogs Eat Plantain? Vet-Approved Nutrition Facts & Info

Plantain is a fruit that looks very similar to a banana. The fruit is starchy and is not generally eaten raw, but it is regularly used in cooking in some countries around the world. High in dietary fiber and with...

ripe-plantains-on-rocks

Can Adult Dogs Eat Puppy Food? Vet-Approved Facts & FAQ

We all know that there is puppy food and adult dog food. If you are the proud owner of a new puppy, congratulations! But if you already have an adult dog in the home, you know that there’s potentially going...

Can Adult Dogs Eat Puppy Food

Can Dogs Eat Raw Salmon? Vet-Verified Nutrition Facts & Advice

Salmon is packed full of healthy nutrients and is considered by some to be one of the healthiest protein sources since it provides essential vitamins and is a great source of omega-3 fatty acids. But what about raw salmon? Is...

Can Dogs Eat_salmon

9 Best Affordable Canned & Wet Dog Food in 2026 – Reviews & Top Picks

Did you know that the average American dog owner spends over $400 a year on food? In fact, dog owners spend more on food every year than they do on other pet-related expenses, such as vaccinations, grooming, pet insurance, training,...

person giving food to shih tzu dog

Coconut Oil Dog Treats: 7 Vet-Approved Homemade Recipes

Coconut oil seems to be a miracle cure and go-to for many things these days. This nutrient-dense ingredient can easily replace other less-healthy oils in meals, and we can even safely share this neutral, hypoallergenic substance with our canine counterparts....

beagle dog having treats

We Feed Raw Dog Food Review 2026: Our Expert’s Opinion

Has your dog had digestive issues? Have you often wondered whether his or her kibble could be the culprit? If so, you are not alone. It is something all pet parents go through at some point in time. You may...

Dogster_We Feed Raw Dog Food Review

Love Dogs? So Do We! Join the Dogster Community

Stay informed with expert pet care insights delivered straight to your inbox! Discover professional guidance on animal behavior, feeding tips, trusted product picks, and much more.




Sign up for the Dogster Email Newsletter