I don't think ducks really notice or mind, much like chickens. Mine are a lot of different breeds and they all get along. Same with dogs lol although that said I do think sometimes they prefer their own breed, like herding dogs have a totally different play style than retrievers, and huskies, samoyeds, etc. Are much more of a "pack breed" and love dogs of their own breed/type. And even the chickens sometimes seem to hang put with each other. Like my Australorps are bullies and the Orpingtons are best friends.