First of all..welcome to YorkieTalk. You might want to think about changing both of your foods to a better quality. Here's the link:
http://www.yorkietalk.com/forums/yor...e-samples.html Science diet is not very palatable. Many of us start out feeding Science Diet because that is what our vets carry. I became more educated once I joined YT. Hope someone else jumps in and helps you with the question about your puppy eating adult food. I think that it is important that your puppy eats food that is made for younger dogs, but let someone else confirm that. ~Joanne~
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Joanne

Eli

Chipper

Eva

Snowboy

Rosie(R.I.P. 1996-July 29, 2013)

Cocoa(R.I.P 1998-April 26, 2012):