Why does my dog lick my other dogs head?
These dogs know and trust each other.
They also look out for each other: A dog who excessively licks the muzzle of his canine pal may be doing this because the dog has a tumor, cut or other medical need that requires attention and treatment.
Puppies also "kiss" their mothers, but it's not a gesture of affection.
Dogs also lick because they like the taste of an owner's salty skin and out of habit.
Mostly, with domestic Dogs, it's a sign of affection.
Licking releases pleasurable endorphins which gives Dogs a feeling of comfort and pleasure — like the feeling people get when they are biting their nails — it relieves stress.
Many believe it's instinctual behavior, harkening back to the days when your dog's wild ancestors would mask their scent to help them sneak up on their prey.
Wolves, for example, have been observed rolling in animal carcasses or the droppings of plant-eating animals, to cover up their own smell during the hunt.
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