Uh, I think most dogs can naturally swim, there Chief...
but I dunno how much a dog can carry while it's, ah, dog-paddling.
I think you're gonna have to think of some other way to get all the supplies across there, Chief.
Maybe the dogs could swim back and forth, and ferry over little loads at a time, for a while?
Hell of a way to run a railroad though, if you ask me.
There are too many canines in Special Forces. We need more kittens! (and moose)