Have Cat Questions? Ask a Cat Vet Online.
Hi, this is Dr. Hill. The pain on Riley's side sounds like a possible cat fight wound. They are typically very painful and have only tiny marks from a claw or tooth. The other possibility is that he could have sustained trauma, a fall or hit on that side. Cat fight wounds will usually fester in a couple of days and typically cause a fever. I would keep him indoors today. You should offer some canned food to encourage eating, as long as he has not vomited for a few hours. I recommend that you take him to your veterinary hospital tomorrow because he needs pain medications and may need antibiotics. Hope this helps and feel free to ask additional questions. Take Care.