Oh dont worry, we never use the store stuff on her! WE used Advantage or K-9 Advantage (I dont remember which one) the first time we gave her flea medicine. I hope that she likes Nutro, if she does we'll start feeding it. I think she would still need the puppy food though? Or could we go ahead and buy the adult? She just turned 15 weeks old today. She has a vet appointment tomorrow, and we are going to ask about when she can be spayed, too.