Why dogs do not lift their legs to urinate even when they are adults

The data shows that only male dogs will lift their legs to pee, female dogs will never do so. And it is adult male dogs, younger male dogs, but also just squatting to pee. Some adult male dogs, because of skeletal problems, such as calcium deficiency and so on, will not lift their legs to urinate. The age at which male dogs begin to lift their legs to urinate varies, and there is some variation among individuals, but most dogs will learn to lift their legs to urinate by ten months. Some dogs have habitual problems and do not lift their legs all the time, there are some.