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

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.

Talk With A Vet Online

Peace of mind,
anywhere, anytime

Affordable vet advice

250 Cartoon Dog Names for Real-Life Goofy Pups

Searching for the perfect name for your new dog can be very exciting but also a bit overwhelming. After all, there are limitless...

What Do Pet Sitters Do For You & Your Dog? 12 Important Responsibilities

When you go away, you trust your dog sitter to take care of one of your most precious family members. To some people,...

Loyall Life Dog Food Review 2025: Pros, Cons, Recalls & FAQ

Review Summary All dog owners are looking for the best nutrition for their dogs in the food they buy for them. There are...

How Much Exercise Does a Dalmatian Need? Vet-Verified Facts & Care Tips

All canines require daily exercise, but some pups need more than others. It all depends on the breed! How much exercise a dog...

More related

6 Common Health Problems in Pugs (Vet Answer)

In the veterinary world, we have seen an uptick in what are referred to as brachycephalic breeds. These are more lovingly known as...

Kishu Ken Dog Breed Guide: Info, Pictures, Traits & Care

The Kishu Ken, also referred to as Kishu or Kishu Inu hails from the mountainous region of Kishu, Japan. Some historians believe that...

7 Common Miniature Schnauzer Health Problems: Vet-Verified Causes, Signs & Treatment

As the saying goes, good things come in small packages. And this is also true for our canine companions. On the other hand,...

10 Best Dog Toys for Chewers in 2025 – Reviews & Top Picks

Some dogs are gentle with their toys. Others? Not so much. If your canine falls into this latter category, you need to be...

Keep reading

Can Dogs Eat Celery? Vet-Approved Feeding Facts & FAQ

Looking for a healthy snack option for your dog? While you might be tempted to toss them whatever food you’re holding at the moment, there are some foods that are better than others, and celery is a great option, although...

Can Dogs Eat Celery

Can Dogs Eat Gourds? Vet-Verified Facts & FAQ

Gourds are often used for decorative displays in autumn, both in the home and the garden. They’re all part of the Cucurbita family, which includes pumpkins and squash. Gourds are generally safe for dogs in small quantities. Still, there are...

Can Dogs Eat Gourds

9 Best Dog Foods for Pyoderma in 2025 – Reviews & Top Picks

Pyoderma is a serious skin condition in dogs. Often, it involves small pustules developing on the surface of the dog’s skin. However, there are many different symptoms, including hair loss, itching, and dry skin. Different breeds are more prone to...

shiba inu dog scratching its ear

Can Dogs Eat Rice Pudding? Vet-Approved Facts & FAQ

Anyone who owns a dog knows how it feels to be enjoying a yummy snack only to look over and see big, begging eyes watching each bite you take. With the close relationship we share with our dogs, it’s only...

Can Dogs Eat_rice pudding

11 Best Canned & Wet Dog Foods for Sensitive Stomachs in 2025 – Reviews & Top Picks

You feel like you’ve tried everything, and your pup’s still sick. The dog food you can buy at your local grocery store doesn’t work for everyone—and now that includes your dog. If your pooch has a sensitive stomach, finding the...

Dalmatian eating dry dog food

Can Dogs Eat Vegetable Oil? Vet-Verified Facts & FAQ

Vegetable oil is used in cooking and found in a variety of products, which may have you wondering if it’s safe for your dog. After all, it’s easy to accidentally give your dog something with vegetable oil without realizing it....

can dogs eat vegetable oil featured graphic Dogster

10 Best Dog Foods for Bloodhounds in 2025 – Reviews & Top Picks 

Bloodhounds are having a bit of a moment. Trumpet, a 4-year-old bloodhound from Illinois, won Best in Show at this year’s Westminster Kennel Club Dog Show. Dog lovers everywhere are learning what you already know—bloodhounds make amazing pets! Finding the...

bloodhound on the porch

Can Dogs Eat Yogurt? Vet-Verified Nutrition Facts & FAQ

Yogurt is one of the rare treats that blends a delicious flavor with potential health benefits. If you’re a diehard fan of the tasty dairy delight, you’ve probably wondered whether your pets could enjoy it as much as you do....

Can Dogs Eat Yogurt