I take Duke and Champ together. I have not tried all three yet as the older two are not due again until November. But if it works out that Chopper is due around the same time, I will give it a shot. Duke thinks everyone in the vet is his best friend and Champ is scared to death and sits right next to me shaking. If I have to take Chopper to then he can sit in my lap. Neither one of them are barkers at the vet, Duke just does the boxer-wiggle trying to get everyone to pay attention to him But I almost always go alone-never a problem.