What is the proper way to introduce a reactive dog to a new pet sitter? We have two dogs (3 y.o. - cattle dog, pit, Australian shepherd and small percentages of other mixes and ~5 y.o. - pit mix) and have used the same pet sitter for 3 years. Her availability is becoming limited due to being short staffed so we need a backup person. One of my dogs barks/growls whenever someone is in our home (which causes the other dog to react) so I always keep them kenneled or separated from our guests by the backdoor with a baby gate. I NEVER leave them out to roam freely when we have guests out of fear. He was fine until he turned about 6 months and then he just seemed to hate people so I just didn't want to chance it. Both dogs are neutered. They do fine when boarded at the vet but they aren't mixed with the other dogs (as that's my preference).