note, a BEACH is not the same setup as what i have there, --------->on a BEACH, it's same as on the street, your dog-aggressive dog can easily run up on the beach and start up some trouble with innocent passerby dogs, but, if you have a sand bar in the middle of a lake somewhere, which is NOT near a beach, yet just deep enough for your dog to have to SWIM to get around, this might be worth checking out. On this sandbar, no one can even tell Buddy is dog-aggressive dog, unless they notice how all the other dogs stay away from Buddy. (Buddy makes faces that the other dogs see, and the other dogs just move away) Turns out, *my* dog can't really get a full on reaction going in water, who knew? My dog can barely bark at all if he is swimming...he just can not really get himself fully escalated or upset when he is swimming. and of course, i play with Buddy, to help him learn, "i can be by dogs and play with mom" and i make sure that Buddy realizes he IS getting rewards for his calm, although tired, behavior, to help him make yet more positive associations to watching dogs, and so Buddy can even observe what dogs are supposed to do when they play!