My friend has a patterdale and she is one of the nicest little dogs I've ever met. She's very friendly and obedient, in fact my friend's wife has just had a baby and the dog has learned very quickly that she is not allowed near - if the baby starts crying she gets up and leaves the room. When it comes to other animals she's not so nice though, she has to be kept away from other dogs and has killed a good few wild animals (including a pheasant which was still alive when she started to eat it!).