We recently adopted a German Shepherd (GSD), and after weeks of trying, my cats are continuously very aggressive with him and refuse to coexist. He is super energetic, can run for ages, very cognizant of sidewalks and changes in the road or path. He is a male, purebred, still intact (we are in the process of getting him neutered), weighs 50 lbs, and is friendly with other dogs and kids. Currently located in Las Vegas area, if you are a runner and would love a great running partner and can provide a permanent, warm, caring home, please reach out! Thanks.