all dogs are evil as are their owners, and oh yeah, their kids too... now really....
my dog swims rapids like he's creeking, and my 4.5 yr old kid thinks he's the next EJ and well.... at least he can roll and surf, the kid that is.
Personally, Pitbulls are not really friendly dogs, they're one-person animals with a bad rep that is well deserved and I think they should be shot on sight. They typically do not get along with other dogs, not to mention people. They've been bred and inbred for one thing in mind, fighting.
Most river dogs I have seen are pretty well behaved, although their owners really need to clean up after them. I get tired of stepping in dog crap at Smelter. There are enough bad smells down there from the sewage plant without adding more.