How long can a dog go without eating?

Adult dogs should not skip more than 24 hours without eating if they seem unwell. Puppies, elderly dogs and small breeds need vet attention sooner — often within 12 hours.

Should I worry if my dog skips one meal?

One missed meal in an otherwise bright, active dog may be fine — especially in hot weather. If they refuse a second meal or show vomiting, lethargy or pain, contact your vet.

Can stress cause a dog to stop eating?

Yes. Moving house, fireworks, a new pet or routine changes can reduce appetite. Rule out illness first — stressed dogs still need a vet check if not eating persists.

When is loss of appetite an emergency?

Seek urgent care if your dog is vomiting repeatedly, has a distended abdomen, pale gums, known toxin ingestion, or has not eaten for 24 hours alongside lethargy.

Dog Health

Why Is My Dog Not Eating?

Quick answer

A dog skipping one meal is not always serious, but **refusing food for 24 hours** — especially with vomiting, lethargy or abdominal pain — needs a vet check. Puppies and elderly dogs should be seen sooner. Never force-feed; offer small amounts of warm food and contact your practice if appetite does not return.

Key takeaways

Adult dogs should not skip more than 24 hours without eating if they seem unwell. Puppies, elderly dogs and small breeds need vet attention sooner — often within 12 hours.
One missed meal in an otherwise bright, active dog may be fine — especially in hot weather. If they refuse a second meal or show vomiting, lethargy or pain, contact your vet.
Yes. Moving house, fireworks, a new pet or routine changes can reduce appetite. Rule out illness first — stressed dogs still need a vet check if not eating persists.

The full picture

Causes, home monitoring, treatment options and the exact signs that mean call your vet — in the complete guide.

Read the full guide Check symptoms

Frequently Asked Questions

How long can a dog go without eating?: Adult dogs should not skip more than 24 hours without eating if they seem unwell. Puppies, elderly dogs and small breeds need vet attention sooner — often within 12 hours.
Should I worry if my dog skips one meal?: One missed meal in an otherwise bright, active dog may be fine — especially in hot weather. If they refuse a second meal or show vomiting, lethargy or pain, contact your vet.
Can stress cause a dog to stop eating?: Yes. Moving house, fireworks, a new pet or routine changes can reduce appetite. Rule out illness first — stressed dogs still need a vet check if not eating persists.
When is loss of appetite an emergency?: Seek urgent care if your dog is vomiting repeatedly, has a distended abdomen, pale gums, known toxin ingestion, or has not eaten for 24 hours alongside lethargy.

Reviewed 2026-06-25 against UK veterinary guidance · Information only — not a substitute for seeing your vet.