I had the perfect fishing dog. He was an English pointer, and a pretty good bird dog. When I'd fish a couple ponds on some private land in Texas, he'd run off for half a mile or so, leaving me the hell alone and check in every 15 minutes or so. Then it was back to chasing butterflies and squirrels. Perfect!
As for a dog that hangs around, wants to go swimming where I'm fishing, and gets underfoot? I'll pass.