I kept Choco, my chocolate chihuahua, on Eukanuba puppy food for about 6 to 7 months. What I did was slowly wean him off his puppy food by mixing a little of both foods until his puppy food was gone. His veterinarian suggested I do this so as not to disrupt his digestive system. Choco is now 11 yrs old and is now on Science Diet senior little bites. I couldn't find Eukanuba anymore and since Science Diet is also a chicken based food, I chose it as a replacement.