why do dogs lick other dogs ears?

Dogs lick other dogs' ears to determine their identity

A dog's sense of smell is 100,000 to 1,000,000,000 times more sensitive than that of a human. This makes the dog's sense of smell 10,000 to 100,000 times more sensitive than that of a human.

 The dog's nose has about 220 million olfactory receptors, compared with 6 million in people.In addition to detecting the value of the scent of a particular scent in the air, the dog’s nose has another extremely important function. Nose hairs can detect various chemicals in the air. Dogs detect many scents, e.g. pepper, acetone, gasoline, paints, and the like, that humans can’t detect with the naked eye.

 Hairs in dogs do not have a protective coating that limits the absorption of these chemicals by the hair.

 So if you were to rub a scent into a dog’s fur, the chemicals will be absorbed deep into the hair and can be in that hair for a long time. The dog provides a safe haven for the chemicals. If you were to put a substance that had the potential to kill a human in the dog’s mouth, you would be exposing both the dog and the human to the potentially fatal chemical. But because the dog can detect the chemical from a distance and because the dog has no protective coat, both can inhale the chemical over a long period. The dog is essentially re-absorbing the potentially fatal chemical into its own body, thus reducing the amount of exposure to the danger. This is what makes the act of licking a dog’s ear a sign of affection and support rather than a dirty trick. 

If you scratch the dog’s ear, you likely will be doing this out of love and concern for the animal rather than a dirty trick. The act of licking a dog’s ear may also serve to promote bonding with the other animal. Whether it is a dog or a human, we express our love and affection through unsupervised play. Licking the ears of another dog is not a means of summoning the help of another friend.

Dogs also lick each other's ears as a greeting ritual

Dogs also lick each other's ears as a greeting ritual. When a dog licks the inside of another dog's ears, it's a signal that they're familiar with each other.It’s an attempt to establish contact and the chance for the two animals to exchange personal information.

 We humans children tend to be very fearful of dogs, but when other dogs join in on the greeting ritual, it gives us the courage to approach them. It’s kind of like how kids will sometimes get antsy from people who don’t speak to them in a friendly manner. In the same way, dogs who lick your dog’s ears, it’s an attempt by the dogs to show their affection for you and establish a relationship. Dogs use their tongues to communicate in a variety of ways, depending on the specific breed and what type of dog you have.

 You can see in the picture above that the dog in the middle is speaking to the dog on the left. They use tone, pitch, intonation, intonation definition, intonation usage, intonation contrast, speed, and pitch accent to define words and convey different meanings.

 To be useful to other dogs, dogs use body language. If the dog on the right is facing away from the dog on the left, it’s a signal that the dog on the left won’t be needed for awhile. Similarly, if the dog on the left is facing away from the dog on the right, it’s a signal that the dog on the right will be needed for awhile. Another reason dogs lick each other’s ears is for recreational purposes.

 Some dog breeds lick their own behind hoping that they will get a coat of ringworm. This is because when a dog licks his own behind, it can trigger an infection. Ringworm often comes and goes within a few days to a week and dogs who lick their own itches often get ringworm as a result.

 Dogs lick the ears of their peers to show that they are not threats or enemies

Dogs lick the ears of their peers to show that they are not a threat. It's a sign of passive submission.

 This is why dogs lick their owners' faces—they're basically saying, "I love you." Dogs lick their own tails to warn other dogs about approaching their nest. As soon as the dog’s tail starts lashing out, he knows that there’s a potential predator close to his den. By licking his tail before the alarm sounds, he’s letting the other dogs know exactly where he’s located. Dogs will also lick themselves on their hind legs in an attempt to confirm their territory. If another dog approaches a dog’s territory and the dog feels that he has been properly greeted, he will lick his hind legs in a gesture of subservience, proving to his human companions that he, indeed, belongs. We can see that grooming your own dog or your pet’s body in a bid to prove your dominance over other canines is nothing more than an act of submission. 

A dog owner showreel may seem amorous, but in reality, they are expressing submission to their own kind. The sole purpose of negging, licking, and pinching is to compel your own dog to move in a certain direction or to allow you to carry something further. So if you want your dog to perform some sort of action, you must first gain his compliance. Once you have that, it becomes more of a game. Just because your dog has completed the action you asked of him, does not mean he loves you any more. 

Letting your dog lick your face is not only a sign of affection but it also helps you achieve two other goals: self-grooming and controlling your dog’s future interactions with other animals. Negging has a low probability of success, because it relies primarily on visual signals to achieve an aggressive action. When your dog is lapping at your face, you can neutralize potential aggression with gestures and words.

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