I have 6 total currently all herding breed mixes and 3 of the 6 are great and I would trust off leash. They actually help me herd the chickens, ducks and turkeys and will watch the babies as they grow up no issues. The other three are all rescues and have at one time or another had to catch their own food to survive. They look at the chickens as a food source and if the gate were every left open I have no doubt that they would help themselves to the buffet. My avatar picture is my 4 year old aussie girl. She will watch the chicks hatch in the incubator and come out with me to watch as I work in the brooders with the chicks. They will even come up and peck at the hair and whiskers on her face. She's a born momma even though she's never had puppies and taking care of littles seems to be in her DNA. Wish I have a ton more like her.