Why do dogs pee and poop to pick a place

Why do dogs pee and poop to pick a place dogs pee and pick a place because they are looking for a place to facilitate “communication” with their own kind, using excrement to communicate, to glandular secretion to transmit information. So the dog will look for some poles, tree trunks, corners, these are fixed buildings, dogs defecate that expand their territory, this is the nature of the animal.