Thanks for all the advice...

One time he got sick because my son got a can of wet food from I don't know where...it was one of those cheap ones and he gave it to him... he got sick so bad and we didn't notice it after 2 days when we saw that he couldn't even walk and we saw he was pooping with blood. He had a high fever and the Vet said he got an infection that maybe that food had to much fat in it. they gave him Antibiotics and some medication and a diet of Chicken soup with rice for a whole week.