A male dog marks it's territory after a female pees on a certain area. Much like the miners during the Gold Rush, dogs are territorial animals. They "stake a claim" to a particular space, area, or object by marking it, using a variety of methods at different levels of intensity.
A more dominant male comes into the territory of a female who wags her tail and shows submissiveness to the dominant male in her neighbourhood. The other dogs pee to mark their territory. And what's with the backward kicking / scratching of the legs, eh?
For example, a dog may bark to drive away what he perceives to be intruders in his territory. Some dogs may go to the extreme of urinating or defecating on something to say "mine!"
Dogs don't urinate or defecate out of spite or jealousy. If your dog urinates on your baby's diaper bag, it's not because he is jealous of, or dislikes, your baby. The unfamiliar scents and sounds of a new baby in the home are stressing him out a bit and he feels the need to reaffirm his claim on his territory.
Likewise, if your dog urinates on your new boyfriend's backpack, it doesn't reflect his opinion of your taste in men. Instead, he has perceived the presence of an "intruder," and is letting the intruder know this territory belongs to him.
Source: humanesociety.org
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