How Long Can a Dog Go Without Eating? The Surprising Answer!

By Lorre Luther · Reviewed & fact-checked by Dr. Lorna WhittemoreVet Approved

Reviewed & Fact-Checked byDr. Lorna WhittemoreVeterinarianLorna is a Scottish vet who has lived, studied, and worked on three continents and has a love of travel. With 20 years of experience in small animal medicine andsurgery, both in the charity and private sector. Gaining a further qualification in feline medicine has given her a continued sense of amazement at the fabulous animals. Currently living in Cape Town, South Africa, with her family and expanding number of pets allows her to spend time in and around nature where she is at her happiest. With a love for learning, Lorna is enjoying researching, editing, and fact-checking for Hepper veterinary editorial team and truly feels that she has the best job in the world!View authorThe information is current and up-to-date in accordance with the latest veterinarian research. Read about our vetsUpdated on March 25, 2025

In this article

Why Is My Dog Not Eating?Is There Anything I Can Do To Encourage My Dog to Start Eating Again?What About Senior Dogs?

If your pup has spent the last few days uninterested in eating, you might be wondering how long they can safely go without food and if you should contact your dog’s veterinarian. Most dogs that are drinking water can technically go for around 3 days without eating ¹, but that doesn’t mean it is healthy or that you should accept the situation and do nothing. If your dog shows any other signs of illness, such as lethargy or vomiting, it’s best to immediately reach out to your veterinarian. Otherwise, you can wait for 24 hours or so to see if there’s any improvement. Puppies, however, need to eat every few hours and should be seen by a veterinarian immediately if they lose interest in food ².

Why Is My Dog Not Eating?

It depends. There are many reasons dogs won’t eat, from the mundane to the serious. Dogs have been known to “stop” eating because they get plenty of “nourishment” from treats. On the other hand, a lack of appetite can also signify something more serious such as dental disease or cancer. The reasons dogs stop eating fall into three distinct categories: medical problems, stress, or issues with the food itself.

white fluffy dog not eating — Image Credit: Varvara Serebrova, Shutterstock

Medical Issues

Lack of an appetite is often a sign of illness in dogs, just as it is in humans, and it can signify that your dog has any number of illnesses such as gastroenteritis, dental issues, parasites, or pancreatitis.

Stress or Anxiety

Dogs often stop eating or eat far less when they’re under stress. Lack of interest in food is a very common indication that a dog is feeling anxious. Common stressors that often lead to food avoidance include changes in the environment such as moving, the arrival of a new baby, or the introduction of another animal to the home.

Some dogs are sensitive to loud noises such as fireworks, home repairs, and construction. Others just don’t like to eat around other animals, particularly if there’s a bit of bullying or food competition. As a general rule, dogs that have stopped eating because of stress will return to their food bowls within a day or so of the stressor being removed from their environment.

labrador dog eating — Image Credit: Olena Yakobchuk, Shutterstock

Food Issues

Dogs can be finicky when it comes to food! If your dog is otherwise healthy but uninterested in the kibble from the bottom of a large bag, your companion might be unhappy with the taste of their dinner. Check the expiration date on the bag and consider investing in an airtight container to keep the food fresh for longer. Also, some dogs lose their appetite because there’s no control over the feeding regime, and they’re full after eating tasty human food or too many treats.

Is There Anything I Can Do To Encourage My Dog to Start Eating Again?

Start by ensuring you’re giving your dog fresh food that has not expired. Buy a small bag or a few cans of their favorite food and see if that helps move things in the right direction. Try giving your dog wet food! Most dogs prefer the taste of canned or pouched food, and it can also give you a clue about what might be ailing your companion. If your dog avoids kibble but happily eats canned food, your pet may have a dental issue that’s making it hard for them to chew—this is more likely if you have a senior canine.

What About Senior Dogs?

jack russell senior dog sleeping — Image Credit: Gabriela Neumeier, Pixabay

Older dogs sometimes stop eating because they’re having cognitive difficulties making it difficult to remember where their food bowl is located. And if your senior pet has trouble seeing, it’s essential to put their food and water bowls in the same location every day to help minimize confusion.

While it’s usually okay to wait for a day or two if your dog stops eating, it’s best to reach out sooner if you’re dealing with an older pet. Most veterinarians suggest reaching out if your senior dog hasn’t eaten in 24 hours.

Finally

In conclusion, while it is technically possible for dogs to go 3 days without food as long as they are drinking you should reach out to your vet before this. There are many reasons a dog may stop eating and it can take some detective work to find out why.

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Sources

Featured Image Credit: eva_blanco, Shutterstock