After dogs eat and drink water, their bodies need to eliminate what they have digested and it comes out of their rears as waste. Their urine, is usually yellow and can stain carpeting, furniture, clothing, you name it. In fact, male dogs can urinate on things that are above the ground or floor because they lift their legs when they pee. A dog can pee on the side of a couch or even on your windows. And they don’t always eliminate outdoors. Source: Animal Liberation Front