The Vet filed an affidavit when Michael lied in court. I don't know if know if the info is still available. If it would make a difference, I would hunt for it.
If you stumble across it, I'd like to see it. Otherwise, don't worry about it.
It's interesting, though. There was a notion that was in vogue many years ago, called "The Homicidal Triad". These three criteria were thought to be present in most murderers: bedwetting, setting fires, and cruelty to animals.
I haven't come across this in many years, so it may have been disproven.