Pupkeeper
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.

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Key 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

  1. Call your vet now if you see any of the warning signs on this page.
  2. If a toy puppy is also weak, wobbly or very sleepy, it may have low blood sugar. Go to a vet now.
  3. If an adult dog is otherwise acting normally, try warming its food slightly or softening dry food with warm water.
  4. Call your vet if an adult dog hasn't started eating within 12 to 24 hours, or if its eating habits keep changing.
  5. 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

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.