Care guideEmergency
Not eating (loss of appetite)
A healthy adult dog may skip a meal, but call your vet if it won't eat for a day. A puppy that refuses more than one meal needs a vet right away.
Get your dog to a vet as soon as you can
Find an emergency vetKey facts
- Verdict
- Care guide · Emergency: get help now
- Call your vet if
- No food at all for 24 hours, a young puppy that refuses more than one meal, vomiting or diarrhea as well, not drinking either and low energy, weakness or signs of pain. All 8
- First step
- Call your vet now if you see any of the warning signs on this page. All steps
- Sources
- PDSA, AKC, Merck Veterinary Manual. Reviewed 9 October 2026.
What to do
- Call your vet now if you see any of the warning signs on this page.
- If a toy puppy is also weak, wobbly or very sleepy, it may have low blood sugar. Go to a vet now.
- If an adult dog is otherwise acting normally, try warming its food slightly or softening dry food with warm water.
- Call your vet if an adult dog hasn't started eating within 12 to 24 hours, or if its eating habits keep changing.
- If your dog recently started a new medicine and its appetite changed, tell your vet right away.
Don't
- Don't give human medicines or appetite boosters unless your vet tells you to.
- Don't keep switching foods or adding human food to tempt your dog. Frequent changes can upset its stomach.
- Don't wait days with a young puppy, a diabetic dog, or a dog that is also vomiting or has diarrhea.
When to call your vet
- No food at all for 24 hours
- A young puppy that refuses more than one meal
- Vomiting or diarrhea as well
- Not drinking either
- Low energy, weakness or signs of pain
- A sore mouth, extra drooling, or eating on one side
- Weight loss, or yellow skin or whites of the eyes
- A dog with diabetes that skips a meal
Why
Illness, pain, a sore mouth, stress or a change of food can all put a dog off eating. Tiny puppies can use up their blood sugar between meals, so missed meals matter more for them.
Sources
- PDSA: My Dog Isn't Eating Properly
- AKC: Why Is My Dog Not Eating? Common Causes of Loss of Appetite in Dogs
- Merck Veterinary Manual: When to See a Veterinarian (table)
- AKC: Hypoglycemia in Dogs: Signs, Symptoms, and Treatments
Guide reviewed 9 October 2026. Page updated 7 November 2026.
General information from the sources above, not a diagnosis. When in doubt, call your vet.