My male has always been a squatter or at least kept all four paws on the ground. I noticed that he tried to pee on my female boxer while she was peeing. She will start her business and then he will come up and sniff at her then lift his leg and try to pee on her. It was the weirdest thing I have ever seen. She didn't seem to mind but I did and let him know I did not approve. He doesn't do it every time but I have noticed it every now and then. Why would he do this? They are both fixed but I assume he is claiming her as his?