My 6 mo old workingline gsd is constantly trying to chase and bark at my cat somewhat aggressively. It has gotten to the point that our cat practically lives in our bedroom (which is so unfair for her). When my dog is in his crate, he constantly barks at my cat when she is just roaming around. If he is out of the crate and we forget to close the bedroom door or she is out roaming, he chases her and barks aggressively. It can be scary at times. I have tried to expose him to the cat woth his leash on and give him treats and try to calm him down but he is relentless and hyperfocuses on her. He is otherwise a GREAT dog but his prey drive is insane. Any tips and tricks will be super thankful. I want them to be able to live together in peace.