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

Dog Health & Care

Why Is My Dog Not Eating? 9 Vet-Verified Reasons & What to Do

Jana Blagojevic
By Jana Blagojevic · Reviewed & fact-checked by Dr. Ashley DarbyVet Approved
Dr. Ashley Darby
Reviewed & Fact-Checked byDr. Ashley DarbyBVSc (Veterinarian)
Dr. Ashley has worked in mixed and small animal emergency clinics and general practice ever since 2017 after studying Sydney University. She grew up in South Africa and England before moving to Australia, and her passion for animals came from many childhood safaris in the Kruger National Park.View authorThe information is current and up-to-date in accordance with the latest veterinarian research. Learn more
Updated on June 27, 2026
Share
Beagle dog lying down waiting for owner with sad face

The role of every dog owner is to do everything it takes to keep their puppy happy and healthy. So, it's understandable that many owners panic when their dog displays unusual behavior. When your dog suddenly stops wanting food as much or stops eating altogether, it may cause you some stress.

If you are interested in the reasons why your dog might stop eating, stick with us for some useful information.

dogster face divider

The 9 Possible Reasons Your Dog Is Not Eating

1. Your Dog Doesn't Like the Food

We all want to give our dogs the best, but sometimes, dogs can become spoiled and picky when it comes to their food. So, if they stop eating suddenly, this just might be a sign they don't like the food you gave them.

You should check the expiration date and see if the food is still usable. If it isn't usable, you shouldn't give it to your dog because it can potentially cause health problems.

This can also happen when you introduce a new type of food to your dog; if they don't like the smell or the taste, they may refuse to eat it.

Image Credit: New Africa, Shutterstock

2. Overfeeding

If your dog is not hungry, they won’t eat. If your dog’s body condition score is on the heavier side, you may be offering them too much food every day. These dogs will often eat tastier food if offered to them, but it’s important not to do this as it will create unhealthy eating habits. Being overweight can increase the risk of health problems like joint disease and even some cancers. If you’re not sure how much your dog should eat, check the feeding guide on your dog food packaging and talk to your veterinarian.


3. Eating at a Particular Time of Day

As we all know, dogs are intelligent animals, and they can quickly form habits. In this case, they can get used to being fed in a particular part of the day and refuse to eat during the other periods. For example, if your dog likes to eat at night, they may refuse food in the morning. While most dogs will chow down whenever they get the chance, this may be the reason your dog’s not eating.

Image Credit: chaossart, Shutterstock

4. Stress

Like humans, many life changes can affect your dog and their appetite. For instance, moving can be very stressful for your dog, resulting in your dog not eating. It is common for the dog to refuse to eat when their owner is away from home as well.


5. Your Dog Feels Threatened

Introducing new animals can also cause your dog to stop eating because they might feel threatened by the new animal or prefer to be alone. Either way, introduce the new pet slowly, and they will learn to coexist over time. Also, it would help if you feed them in separate rooms because one can be intimidated by another's presence and won't eat—they will simply guard the food instead.

Image Credit: p.s.stasya, Shutterstock

6. Age

Age can also be a significant factor in why your dog isn't eating or is eating less. Naturally, young bodies that are still developing need more nutrients from food to develop properly. So, when you get a new puppy, you are shocked at how much food can fit in their little stomach. On the other hand, what happens a lot with senior dogs is that they start to eat less at a certain age in response to lower calorie requirements.


7. Medication

A significant factor to consider in why your dog stopped eating is that many medications can affect your dog's appetite. All medications have side effects, and some side effects mean additional treatment is needed. The lack of appetite could also mean your dog’s original illness getting worse. If you’re concerned about any side effects of medication, call your veterinarian for recommendations on what to do.

Image Credit: Ilike, Shutterstock

8. Dental Problems

The reason why your dog isn't eating might also be because they have dental problems. If you notice that your dog wants to eat but is spitting out their food or drooling, it may mean that they are in pain. They might have a broken tooth or an infection that causes pain and loss of appetite.


9. Illnesses

These are some illnesses that can lead to loss of appetite in dogs:

  • Infections and fevers
  • Gastrointestinal problems
  • Liver problems
  • Kidney problems
  • Pancreatitis

When the liver or kidneys are diseased, toxins can build up in the body, making dogs nauseous. Many of the above problems cause pain, nausea, or lethargy which reduce a dog’s appetite. Pancreatitis is an inflammatory disease of the pancreas that can also cause loss of appetite because it is very painful.

Image Credit; Zontica, Shutterstock
Dogster_Website dividers_v1_Jan 18 2024-01-TEST

How to Help Your Dog

Depending on the cause of the problem, it may be a simple solution to help your pooch get their appetite back. Eating less and not eating at all are two very different things, so you should take things more seriously if your dog hasn’t eaten anything in 24 hours.

First and foremost, look for other signs your dog might be unwell like vomiting, retching, diarrhea, lethargy, increased or decreased thirst, urinating more, bad breath, and pawing at the mouth. If they show any other signs or they don’t start eating well soon, contact your veterinarian.

If your dog doesn't want to eat because they don't like the taste of the new formula you gave them, you should return to the old, reliable food. When changing the diet you should do so gradually to avoid gastrointestinal upset. You can also try to mix the fresh food with the old one, and you can also try to soften it by mixing it with water to make it more appealing and easier for them to chew.

If your dog is stressed because of some significant changes at home, try to calm them by spending more time with them and reducing their source of stress as much as possible. Playtime is an excellent way of solving these problems and a great way to bond with your dog.

Dogster divider_v3_NEW_MAY_24_

Conclusion

Even though this can be a very stressful situation for every dog owner, you should stay calm and look for any other changes in your dog that can solve the problem—dogs often stop eating because they are stressed or simply being picky. On the other hand, there are instances where some health issues cause a loss of appetite.

Either way, we hope we helped you understand why this is happening, but if you still have doubts, you should contact your veterinarian for a check-up.

Sources

Featured Image Credit: N_T, 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.

Jana Blagojevic
Authored by

Jana Blagojevic

What to Do When Your Dog Won’t Eat: Possible Causes & Solutions (Vet Reviewed)

What to Do When Your Dog Won’t Eat: Possible Causes & Solutions (Vet Reviewed)

It can be stressful if your dog suddenly stops eating, especially if they’re typically a big eater. There are a few reasons that some dogs stop eating, and som…

Brooke Billingsley
By Brooke Billingsley · 3 weeks ago
Why Isn’t My Puppy Eating? 8 Vet-Reviewed Reasons

Why Isn’t My Puppy Eating? 8 Vet-Reviewed Reasons

Puppies have big appetites, so it can be worrisome when they don’t want to eat. Although it can be quite common for new puppies not to have a hearty appetite w…

Sarah Psaradelis
By Sarah Psaradelis · 3 weeks ago
My Senior Dog is Not Eating But Drinking Water: Our Vet Explains What to Do

My Senior Dog is Not Eating But Drinking Water: Our Vet Explains What to Do

It is distressing for any owner to see their beloved dog lose their appetite or stop eating altogether. You may have noticed your dog refusing their food, but…

Dr. Emma Chandley BVM
By Dr. Emma Chandley BVM · 4 days ago
How Long Can a Dog Go Without Food? Vet-Verified Facts & FAQ

How Long Can a Dog Go Without Food? Vet-Verified Facts & FAQ

If your dog hasn't been eating well, it's normal to be concerned, and if it's been a while since your companion seemed interested in food, you might be worried…

Lorre Luther
By Lorre Luther · 1 week ago
June 17, 2026

Why Is My Dog Always Hungry? 12 Vet-Reviewed Reasons

It's no secret that many of our canine companions are voracious eaters! They are always into something and can never be trusted around the family garbage can.…

Ashley Bates
By Ashley Bates
Why Is My Dog Always Hungry? 12 Vet-Reviewed Reasons
June 29, 2026

10 Vet-Verified Signs That Your Dog Is Sick & What to Do

When our dogs are sick, it is essential to seek out veterinarian care quickly. Many illnesses can be treated inexpensively and easily if they are caught early.…

Nicole Cosgrove
By Nicole Cosgrove
10 Vet-Verified Signs That Your Dog Is Sick & What to Do
June 17, 2026

Does a Dog Stress Eat? Vet-Verified Facts & Info

It can be hard to tell what causes a change in our dogs’ behavior. If your dog has suddenly begun eating much more than usual, it may indicate a serious underl…

Jordyn Alger
By Jordyn Alger
Does a Dog Stress Eat? Vet-Verified Facts & Info
June 29, 2026

Why Doesn't My Dog Chew His Food? Vet-Reviewed Facts & FAQ

Unlike humans, most animals don't appear to savor their food by eating it slowly. Some dogs just fill their bellies as fast as possible, whether they're very h…

Keri-Beth Clur
By Keri-Beth Clur
Why Doesn't My Dog Chew His Food? Vet-Reviewed Facts & FAQ
June 17, 2026

What to Feed a Diabetic Dog That Won't Eat: 6 Mealtime Tips (Vet Answer)

Diabetes management in dogs can be a complicated dance between timed feedings, insulin administration, and exercise. When all these elements work in concert, a…

Dr. Chyrle Bonk
By Dr. Chyrle Bonk
What to Feed a Diabetic Dog That Won't Eat: 6 Mealtime Tips (Vet Answer)
June 17, 2026

Why Is My Puppy Not Gaining Weight? 6 Vet-Reviewed Reasons

Puppies seem to grow rapidly before our very eyes. Most puppies are vacuum cleaners, instantly sucking up their food as soon as you put it down. However, if yo…

Ashley Bates
By Ashley Bates
Why Is My Puppy Not Gaining Weight? 6 Vet-Reviewed Reasons
June 17, 2026

Why Is My Dog Gaining Weight But Not Eating More? 10 Vet-Reviewed Reasons

Did you know that 59% of dogs in the United States are considered overweight or obese1? It's true, and extra pounds put dogs at risk of developing debilitating…

Chantelle Fowler
By Chantelle Fowler
Why Is My Dog Gaining Weight But Not Eating More? 10 Vet-Reviewed Reasons
June 29, 2026

Why is My Dog Drinking a Lot of Water? 9 Vet-Verified Reasons

Your dog always needs access to fresh drinking water daily. If you have more than one dog, you might need to fill up their water dish more than once a day. Dog…

Nicole Cosgrove
By Nicole Cosgrove
Why is My Dog Drinking a Lot of Water? 9 Vet-Verified Reasons

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.

You may opt-out at any time. View our Privacy Policy for more information.

The Dogster app on a phone