I imagine it depends on the dog, as they all have different personalities and things they like. Chances are, if your dog runs to the water and doesn't want to leave, loves sticking its head out the car window, and is generally rather couragous, then he/she won't have a problem. If they are more timid, they might be limited to mellow trips or no trips. I would say that if you Dog is terrified of it, that its a bad idea. As an owner you know your dogs personality and whether they could handle trips down the rapids. They should also be reasonably capable of being in roughish water, as there is chance they will fall out. Lastly, just as with people, the dog should always always always have a PFD on. Many companies make them and a 50 dollar investment could be the life or death of your dog. Even if they are awesome swimmers, it helps them to stay higher on the water and keep from getting too tired, and they suffer from the same kinda thing as we do when getting sucked around by currents. Ok, go have fun with your dog and keep them safe when you do.