I, personally would not take him. The risks are greater than the perks. Bullies don't do well with heat nor water. Especially if its a river that moves rapidly. They would need a lifejacket, and constant supervision. They are not agile like a lab who can swim, etc. They would do okay in a still/standing body of water, or on shore of a beach....but river, ehhhh....LOL I say better to be safe than sorry and let Maximus chill at home & snooze haha.