Hi Jeff, I can't answer about the dog, but I will advise that you float at least a half day with aguide, with dog if the guide is willing. There are a number of guides on the river, almost all are good, they have a few current "guide flys" that will catch fish, but rigging them is the secret and you almost have to go with a guide to learn that. There are lots of "holes" along the river and most can be waded. A good map is available. Fish heads of the San Juan, Abes motel and flyshop and Duranglers are all good reliable sources of guides and advice. WELCOME ABOARD THE GREATEST FLY FISHING SITE ON THE INTERNET ! PADDY