I have a retired Greyhound, when she came to me she was fed on kibble, she was very uninterested in it, we changed her gradually onto tinned food, she liked it for a while but went off it, she now eats a raw diet and is thriving, however now and again I like to give her what I (rightly or wrongly) consider to be a treat... Some cooked ham or chicken, she's eats it enthusiastically but within half an hour she is sick, does this mean that she now can't tolerate cooked meat?