Dog barking at the Cats when they're in the garden?

Dogs-Cats.. Well, it is just in their nature to chase cats. It is probably some kind of play between them. You telling them to leave the cats alone and them obeying you shows there is no hate involved. Cats are smart little cookies and most often the dog looses the battle with scars. Just keep reminding your dogs to be good before you let them out to see the cats.