Thanks for the info. This thread has been very helpful. Sasha doesn't seem to be chasing the pullets, but she is very interested in cleaning up after them and does try to get into the run with them; she could damage the fence. Our Pit Bull who is older frequently tattles on her. He has no interest in the birds, just in keeping Sasha in line. I'll start deworming both of them more often now that we have chickens.
I was born on a farm on October 27, 2011. Now I live in the suburbs. Dad is Great Pyrenees, Mom is Border Collie x Springer Spaniel. My brother is a Pit Bull who was rescued from BSL.