My dog is taking Gabapentin and Tramadol for an ACL injury. He will not eat anything at all and sleeps the majority of the time. He drinks some water from time to time and I've started giving him Pedialyte. I have tried hamburger, rice, chicken, turkey meatballs, McDonalds hamburgers, treats, ground beef.....all of his favorites and nothing. I can set the food next to him and I dont think he even smells it as he has no interest in it at all. Not sure what to do. Is this a common side effect of these medications? He is a 7 year old Bernese Mountain Dog. I dont want to give up on him but I dont want him in pain or suffering either.