tumors and bacterial infections

Hello dearers... I wanted to know if any of you had happen to know about perianal adenoma in dogs. Not the Google knowledge, I want to know about your experiences Please share as my dog has diagnosed with one, he's not neutered and he's a senior dog (13 years) don't want to loose him.. please...

We have four coups on a very small plot. One of these coops has had periodic losses of young hens. These pullets have been laying for at least three months. Most of these girls that have died have had tumors somewhere; one had a small tumor on her heart and black intestines. I know that Marek's...