If someone was interested in one of these dogs for sport (agility, flyball, dock jumping, herding etc) and wanted a house pet and a dog that could get along with the other dogs in the house, what breeders would you recommend? I have heard varying advice about working vs AKC and that the working line is fairly sharp and difficult to have in a pack. Do the AKC dogs have drive to do well in sports? I have seen a few but do you have pick a line that is already doing well or is it possible to get a good breeder and then a good pup and be all set? Help me out Any other comments regarding the breed at all is welcome!