I have an old dog. Sam is 14. He has developed arthritis in his back legs. He rarely lifts his leg to pee anymore. Instead he squats more like a female dog. I think the older a male dog gets, the harder it is for them to lift their leg and pee. I can tell if Sam is having a good day by how high he tries to lift his leg when he pees! I think keeping an eye on that as male dogs get older is probably a good indication of arthritis.