I have a Yorkie, he has been diagnosed with colitis 3 mon s ago and has been ok, had blood test...month ago said it was all ok, however last few days has had a very soft stool and a little blood. he only gets a special diet canned food and boiled chicken breast mixed in. My vet has me giving him amoxicillin . What am I missing here also, he had the systems of throwing up and bloody stool for off and on for 2 years, until I went to a vet hospital and they told me his problem.. is there a food I should be giving him? appreciate any help!!!