Just a caution, I'm sure the liver is fine to feed them as is flavouring it with garlic but I've read in several books that onions will cause aenemia in both cats and dogs. I've found dried liver treats called Kitty Kisses that my kitties love. I just shake the jar and they come running. I use it to find out where they are when they don't respond to their names being called. Also since I'm a vegetarian it lets them have something they love and I don't have to prepare the stuff.