in general the "retired" greyhound should have the last 2 or 3 ribs slightly visible, this is a general concencus (correct me if im wrong), you dont have to feed dry food, but if you want to the more expensive the better, brown bread, weet bix, and other forms of cereal will supliment dry food, and dont forget a few veges in the meat too they will probably spit them out if they are not used to veges but they will get used to them. the smaller you can mince them the better. Dont forget to walk them too otherwise you will end up with fatty boom ba greyhounds