I noticed Ned (our 12+ year old gray DSH) was drooling Friday when I got home from work. He wouldn't really let me look in his mouth much but I could see something was wrong in there. He had an abscess in the past requiring a tooth removal. We brought him in to the vet today and he has a tumor on his jaw. The vet said it was a sarcoma and it's very common in cats' mouths and even more common in gray cats. We're taking him in next Tuesday for "bulk removal" and a biopsy but the vet seems to think it is most likely cancerous.