Hi,Lottie has been on Hills Science since she was 11 wks and is now on the adult chicken version.She is very healthy and happy and has a beautiful shiny coat (she's a black lab) and lovely clean,white teeth and very importantly,has no toiletting problems (subtly said!) I buy online though as it can be up to �10 a 15kg sack cheaper.I have used zooplus and seapets.I just look who has the best price at the time.Maybe you could get Purina online come to think of it. Have also tried samples of Arden Grange,Burns and Skinners,all of which we didn't continue with for various reasons. Hope that helps.