Dr. Dave

Doctor Dave slept with one of his patients and felt guilty all day long. No matter how much he tried to forget about it, he couldn't. The guilt and sense of betrayal was overwhelming. Every once in a while though, he'd hear an internal, reassuring voice that said: "Dave, don't worry about it. You aren't the first doctor to sleep with one of their patients and you won't be the last. And you're single. Let it go..."
But invariably the other voice would bring him back to reality:

"Dave, you're a vet..."

Dr. Dave - Dr. Dave slept with one of his patients, his "special" patients.