We adopted a 1 year old border collie-coonhound mix who is now almost 3. We already had 5 ducks and used a shock collar upon first introduction but it wasn’t needed. We then increased our herd and added chickens that were brooded in the house. We would take them out of the brooder and show them to our dog and tell her to be easy with the babies. When the chicks were big enough to try and escape the brooder she would nudge them back inside. When the chicks and duckings moved outside we were still cautious but she had decided they were her babies. Our only issue has been the rooster who will randomly attack the poor dog. She is confused at first and then thinks he is trying to play. She has pinned him to the ground but immediately let him up when he gets too aggressive. Our dog does have a prey drive- no squirrels or rabbits are safe- but because of the introduction she believes our ducks and chickens to be part of the herd. I have never had to use the shock collar but she wears it just in case. We also do not have any squeaky toys. I do believe introduction and the individual dog are key. My neighbors’ have a poodle mix, Australian shepherd and a pit mix that visit our farm and have never bothered our flock and that was a slow, single dog introduction over the course of a couple weeks.