im sorry My Rb Dalmatian ws very aggressive around other dogs,and she was NEVER aloud off leash.When she was tied in the front yard,we made sure she had a good collar on where she couldnt slip out of. Mabye get Josie a no-slip collar for when she's tied out?,and get her a stronger line to tie her with.We just have a 20ft nylon leash,it works good,especially since Kodie is strong.
I dont know why they attack other dogs.I dont know of any good books or anything.