Puppy feeding and growth
How much food does a puppy need once it reaches adult size?
Last updated 23 September 2026 · How we write and check this
Short answer
Once a dog reaches its adult size, its calorie needs drop noticeably compared with its growing months, often by 20 to 30 percent per kilogram of body weight. The right amount depends on adult weight, activity level, and the specific adult food's calorie density, so it is calculated fresh rather than carried over from puppy portions.
Why growth calories do not carry over
Puppy food is formulated with more calories and higher protein and fat per gram to fuel rapid bone and muscle development. Feeding that same volume to a dog that has stopped growing, without adjusting for the lower calorie needs of maintenance rather than growth, is one of the most common causes of early adult weight gain.
Starting point for the new amount
A rough starting point is the adult food's feeding chart for the dog's actual weight, then adjusted based on how active the dog is day to day. A dog getting two long walks and regular off leash play needs more than one getting a single short walk, even at the same weight.
Confirming the amount over the following weeks
Weigh the dog monthly for the first few months on the new adult portion. A stable weight with a visible waist means the amount is right; steady gain or loss over two or three consecutive months means it is time to adjust the daily total by around 10 percent and reassess.
Key takeaways
- Adult calorie needs are typically 20 to 30 percent lower per kilogram than puppy needs.
- Recalculate portions using the adult food's chart rather than continuing puppy amounts.
- Activity level should shape the final portion as much as weight does.
- Monthly weigh ins for the first few months confirm whether the new amount is right.