For now, I worry about our small dog who has completely accepted the birds and they have no fears around her. She wanders around right in the thick of them all the time. That doesn't mean at some point he may view the dog as a threat because she does sniff the hens bums occasionally.
I just encountered this same issue yesterday.
My property is separated by fencing into about 5 sections, with the backyard around the house surrounded by chain link. My little dog, Ruby, only goes in this part of the yard. The chickens have the run of the property during daylight hours. Ruby hasn't shown any interest in the chickens since they were moved outdoors. They love to come into the yard by the house -- maybe because that was their first outdoor space.
Late yesterday afternoon, Ruby was doing her squirrel patrol and Red Rider, my Rhode Island Red rooster, ran after her and grabbed her tail. Ruby yelped and tried to bite him. Neither had injuries, but she got a good scare and he got slobbered on.
Since he isn't a fence hopper like some of the others, I will just not leave the gate open anymore.
Lisa