My 1 1/2 year old billy got a abscess around his stifle joint and I'm trying to figure out if it is CL. I noticed it about August of '09 size was about 1/2" by 1". I talked to some people and they told me just watch it. About a week ago I noticed it and it was the size of a golf ball so I called the vet and he told me the best thing to do would be to lance it. So I lanced it and got yellowish,whitesh,tooth pasty puss out(don't know if their was a smell).I kept it wet to keep the cut open so it could drain but it popped at the very top. The person I got him from gave him a cdt shot but don't know where he gave it to him at. Does this sound like a CL Abscess or just a wound or cdt shot abscess. Any help would be appreciated.