I have killed every possum that I have caught trespassing. I guess they have been quite successful stealing food. They have all been like 12-15 pounds. They always hiss and show their teeth, but never make any attempt to bite. And never get in a hurry to leave. I just shake them out of the cat house and shoot them as they walk away.
No offense and none taken (̿▀̿ ̿Ĺ̯̿̿▀̿ ̿)̄