So our young male cat has started to go out at night and hunt for small rodents to bring back to our house as trophies .last night he brought in a mouse through the pet door that got away from him before he killed it and is now loose in our house. we have set some traps and hope to catch him before he dies in the house and starts to smell. don't know what else to do. needless to say, the pet door has now been closed at night when i go to bed to prevent this from happening again. from now on he can keep that stuff outside. What's the best way to track down and eliminate this critter? any recs?