I am picking up some ducks for the pond today 2 of them will be adult sized the other 2 about half grown. How would you introduce a dog who isn't fond of strange animals in the yard? He is nice to our cats and gets along with other dogs when introduced slowly. But he doesn't like raccoons, opossums, armadillos, snakes or turtles in his yard. I have a place the ducks can go that the dogs can't.