Eating behavior
My puppy isn't eating, when should I call the vet
Last updated 23 September 2026 · How we write and check this
Short answer
Call a vet if a puppy goes more than 12 hours without eating anything at all, skips more than one scheduled meal in a row, or shows any weakness, trembling, vomiting, or unusual sleepiness alongside reduced eating, since young puppies have much less reserve than adult dogs.
Why puppies need a faster response than adults
A puppy's small body size and immature systems mean less stored energy to draw on compared with an adult dog, and small or toy breed puppies in particular can develop genuinely low blood sugar within half a day of not eating, which is a real medical concern rather than simple fussiness.
Warning signs that mean call sooner rather than later
Weakness, trembling, wobbliness, unusual sleepiness, or a puppy that is difficult to rouse alongside reduced eating are all signs that should prompt an immediate call rather than waiting to see if the next meal is eaten normally.
What to have ready when you call
Noting exactly when the puppy last ate normally, whether any other symptoms are present, the puppy's approximate weight, and whether anything unusual happened recently, a food change, a new environment, or a fall, helps the vet assess the situation quickly over the phone.
Key takeaways
- A puppy going more than 12 hours without eating, or skipping more than one meal, warrants a vet call.
- Weakness, trembling, or unusual sleepiness alongside reduced eating are urgent warning signs in puppies.
- Having a clear timeline and details ready when you call helps the vet assess the situation quickly.