Jack Russells drive me nuts. Terriers I don't like to make a generalization. In fact, it's most small dogs. I like shetland sheepdogs though - we have one and I had one growing up. Thye herd children when they're in groups or "packs", if you will - it's pretty funny. We alos have a border collie who belongs on a farm and drives me nuts, as well as a half-rottie/half-lab mut who has a great personality. Very sweet dog.