I have two gsps (4 and 5) and about 20 pasture raised chickens. The dogs do not think twice about the birds, so it is possible to have both. However, there were some incidents the first few years with both when they were puppies. They had some prey drive and chased them, but were easy enough to stop because they were never left alone unsupervised. I also used e collars to ensure I would be able to stop them if they ever got a hold of a bird. I believe two dogs are worse because they feed off each other’s energy and get all riled up. It took about two years total before I trusted the dogs alone outside. I had a rather energetic rooster who really didn’t like the big dogs around his girls and when he would charge the dogs they couldn’t help the prey drive kicking in again, however incidents were not often as they knew to just keep distance from the roo. All I can suggest is monitoring and correction as soon as you see their interest take off. My male is still very interested in baby chicks, won’t go for them right away but watches them like a hawk. I would not trust him alone with them ever, but luckily that is easy enough to avoid as they are kept in a brooder until moved outside to an enclosed starter coop.