We have a 6-7 year old Lab/Rott mix that found us as a stray.
He is a big baby and gentle with kids and other dogs.
He barks at the neighbors cats as they cross their yard and has killed every small animal (cat, skunk, raccoon) that has entered our yard.
He doesn't bother our inside cat and is alpha over our 4 year old Golden.
He listens well EXCEPT WHEN HE IS CHASING OR CATCHES the small animal. He will not stop until it is dead.
He comes when called while barking at cats.
Where do I start to break him of this? Everytime the neighbors come over we have to put him in the house because if one of their cats follow he will kill it!