Puppy feeding and growth
How much should a mixed breed puppy eat if I do not know its adult size?
Last updated 23 September 2026 · How we write and check this
Short answer
Feed based on current weight using a general puppy food's feeding chart, then recalculate every week or two as the puppy grows and gives you a better sense of its likely adult size through paw size, growth rate, and general build.
Working with current weight rather than a guess
Rather than trying to guess an eventual adult size upfront, feed strictly according to what the puppy's current weight calls for on the food's chart. This naturally adjusts as the puppy grows, without needing to commit to a size category prediction that might turn out wrong.
Choosing between regular and large breed formula
If the puppy's build, paw size, and growth rate suggest it may end up on the larger side, above roughly 25 kg (55 lb) as an adult, err toward a large breed puppy formula, since the controlled calcium and calorie density are protective even if the final size estimate turns out a bit off.
Refining the estimate over time
By around four to six months, growth rate and proportions usually give a much clearer picture of the likely adult size than was available at eight weeks, which is a good point to reassess whether the current food category, regular or large breed, still fits.
Key takeaways
- Feed according to current weight on a standard chart rather than guessing adult size upfront.
- Lean toward a large breed formula if build and paw size suggest a bigger adult dog.
- Recalculate the food amount every one to two weeks as the puppy grows.
- Reassess the food category itself around four to six months once growth patterns are clearer.