Dogs wag their tails in order to spread their happy pheromones by waving furiously. They unconsciously want everyone to know they are having a good time. When they are scared, they tuck their tail between their legs in order not to spread their stress pheromones by moving the air around their glands.
Body language in general.
Dogs wag their tails in order to spread their happy pheromones by waving furiously. They unconsciously want everyone to know they are having a good time. When they are scared, they tuck their tail between their legs in order not to spread their stress pheromones by moving the air around their glands.