Holy shit. Just got off the phone with the guy from the lab. I guess he has some huge staph infection that has spread through his body. No cancer thank god. It's treatable, but it'll be pretty hard on him. I was prepared for the worst because they had me bring him back in last night and a different vet looked at him and said it seemed like lymphoma because a lot of his lymph glands were extremely swollen. It was kind of funny because I asked the vet if it was possible they were swollen because they were producing so much extra lymph to wash whatever was in his legs out because I had something like that happen in one of my legs. She asked what happened to me and I said "oh nothing. just something stupid." She kind of pressed it and I said "I'm 5'9, 220 lbs, and don't have that much fat..." She got it after that.
Anyhoo, looks like he's going to be ok. Thanks everyone for your kind words and support. It helped more than you might think.