Puppy feeding and growth
Why did my puppy suddenly start eating less?
Last updated 23 September 2026 · How we write and check this
Short answer
A dip in appetite can come from a growth phase slowing, teething discomfort, heat, stress from a change in routine, or simply having had extra treats earlier. A brief, mild dip with normal energy is usually not concerning, but refusal lasting more than a day or two needs a closer look.
Growth naturally has quieter stretches
Just as growth spurts bring a temporary rise in appetite, the quieter stretches between them can bring a mild, temporary dip. As long as weight is still trending upward overall and the puppy seems otherwise well, a short lived reduction in appetite during one of these quieter phases is not unusual.
Environmental and everyday factors
Hot weather commonly reduces appetite slightly in dogs of all ages. A change in routine, a new environment, or even a change in who is present at mealtimes can also cause a temporary dip, usually resolving within a few days as the puppy adjusts.
When reduced appetite is a bigger concern
A dip that lasts more than 48 hours, gets progressively worse rather than better, or comes with lethargy, vomiting, or diarrhea is different from ordinary appetite fluctuation and calls for a vet visit rather than waiting it out further.
Key takeaways
- A brief, mild dip in appetite alongside normal energy is usually not concerning.
- Growth naturally has quieter stretches between faster growth spurts.
- Hot weather and routine changes are common, harmless causes of reduced appetite.
- Appetite loss lasting more than 48 hours or with other symptoms needs a vet visit.