I'm sorry to hear that Phoenix became so ill after his surgery. It may have been the clavamox or a combination of both meds. After his PU surgery,Storm also became very sick with diarrhea due to the antibiotics and he also refused to eat and drink. I had to give him sub-q fluids and feed him whatever I could get him to eat. I'm glad to hear that he's finally doing better. Get well soon Phoenix.