I have mistakenly given your adult dog food to my puppy. How might this affect a young dog?
It is of course best to feed the best life stage diet possible, and our puppy food is better for the growing dog.
We would expect no adverse consequence from the inadvertent use of a diet designed for a mature dog. If there is any doubt about your pup being well, please do have your vet examine for any signs of ill health. Better safe than sorry!