Do not give up either of the dogs. Maybe you should try to keep them in seperate rooms for awhile, and then reintroduce them. It might work, I don't know. Maybe Zeke is just going through a problem or something and you just do not know. Maybe he likes to take his anger out on Josie. You have to teach him that Josie is not a chew toy. Do not forget that sometimes animals can sense things that we cannot, maybe he became startled or something. I really do not have any more advice to give on this, but I hope this helps!