Welcome! 
I have a Shepweiler (Rottweiler & German shepherd mix = those have been used as driving and herding) and a little pit mix who is very trust worthy with my chickens . I also have a young cane corso who is doing very well learning about life with poultry.
But I've also had a shepherd that had a prey drive off the charts that could not ever be trusted with chickens or any small animal.

I have a Shepweiler (Rottweiler & German shepherd mix = those have been used as driving and herding) and a little pit mix who is very trust worthy with my chickens . I also have a young cane corso who is doing very well learning about life with poultry.
But I've also had a shepherd that had a prey drive off the charts that could not ever be trusted with chickens or any small animal.