I've had both dogs and cats (I now have a Mainecoon - a really big cat that weighs in at 17lbs and is still a bit on the skinny side) and a moggy, she's very petite against Merlin. Considering that Merlin is pampered, he's caught a magpie, a rat and has demolished the local mouse population, hence the rat. The dogs I've had have never effected the wildlife, oh, sorry, I forgot about Sheba, my long-haired alsation, she used to bring in hedgehogs - she thought they were brush-heads and wanted to play. Sadly, though, we now have problems with pigeons, and that's one bird that the cats have never yet caught. The cheek of them. I got up the other day, getting ready to go to work, when I opened the door and shouted for the cats, and the damn pigeons came swooping in - they pinch the peanuts meant for the squirrel (funny really, but that is one animal that my cats don't ever bother with)