Bogie will walk out into a lake and go about shoulder deep. He seems to know that he's not a Michael Phelps, and that swimming isn't a good idea. Our vet told us that their body mass and weight is mostly frontward and that makes is more difficult for them to swim. I'm sure they are like people, some being more athletic and the difference in body structure makes it easier to swim. To be safe a dogiie life vest woud be the safest in a boat, just like humans!!!!