Goliath's neck and have swollen up to twice its normal size; maybe more. We assumed it was just the cancer tumors growing like crazy, and maybe it is, but just a little bit ago in the bathroom, part of the scar from his last surgery popped open from the pressure and a few tablespoons of puss or something squirted onto the carpet. It does not have a rotten smell so I hope that means there is no infection. Maybe the swelling is just a lot of this puss. We are getting ready to take him to the animal hospital to at least have them close the incision again, or maybe put another drain tube in.