At long last I have been able to get computer fixed and join the forum its great for me as I am a first time owner.  I have fed my westie on cesar also tried dry food but he didn't like it much heard a lot about nature diet and saw it in the pet shop today can I change over or do I gradually add some at a time and like a lot he has bad wind he even walks away himself.

Probably best to change over gradually over a few days.