i love pitties.. they are just so cute when they play.. they can have skin problems tho..Have you considered this: An American Pit Bull Terrier, or are they allowed where you live? Right size, most don't mind water and LOVE to spend time with you 24/7 if they can. They are very trainable, actually, though like Border Collies they are also high-energy dogs that absolutely need an outlet for that energy. I used to ride mine in the car or truck with me and they loved to ride "shotgun". You won't have the hair issues that most of the breeds you mentioned will have, if lots and lots of shedding is an issue(some people don't mind it. I'm not one of those people). IF you can find REAL APBT's, not those huge waddling blue hippos that many are still trying to pass off as APBT's(if the average adult can't easily pick the dog up and carry it, it's NOT an APBT, no matter what it says on the "papers") and get to spend time with the parents AND the breeder, it would certainly be worth the time and effort, unless where you live has BSL in effect.
pitbulllady
what about a Blue Healer? VERY smart dogs