Read on Cesar Millans site.
All animals communicate with energy and body language, and its easy to tell just from body language whether theyre fearful or aggressive. But, beyond body language, for many animals there are three important body parts with which they communicate.
Animals primary methods of communicating are through eye contact, their ear position, and their tails.
When an animal is being defensive or aggressive, it will make eye contact to tell whatever its facing to back off. When an animal is alert to danger, its ears will stand straight up. But the most important thing to watch is the tail.
A tail wag is not always friendly
When a cat wags its tail, its not being friendly. Its saying, Watch out, because Im going to attack. When a squirrel wiggles its tail, its saying, Im big and Im threatening, so stay away.
When a dog wags its tail, though, it could be saying a lot of things, depending on how its wagging. And, in fact, a dogs tail is probably one of the most expressive parts of its body, just ahead of its ears.
This is why docking a dogs tail or cropping its ears hinders the dogs ability to communicate effectively. These could be compared to cutting out a humans tongue and removing their vocal cords. When it comes to communicating with body language, those ears and tail are a major way that our dogs speak to each other and to us.
Different tail positions indicate different things
Think of a dogs tail as the turn-indicator lever in your car. It has a natural position, and it has two other positions that indicate different things. When a dogs tail is in its natural position, it indicates that the dog is calm and happy though position varies with breed. Some dogs have tails that naturally hang down behind their legs, while others have tails that curl up over their backs. When the tail is in that natural position and not moving side-to-side, its telling you, Im happy. Everythings cool.
When the tail moves up or down
There are two positions a dogs tail can move to without moving side-to-side: up or down. When a dogs tail moves up, it means that the dog is becoming more assertive or dominant. Its like raising a flag, and the message its sending is this: Im the dog in charge here. When the tail moves down, its sending the opposite message: Youre the dog in charge here. And if a dogs tail curls between its legs, its sending the message, Im harmless. Dont hurt me. I submit.
A raised tail isnt necessarily aggressive but a lowered tail is always submissive.
When the tail moves side-to-side
This brings us to that wagging bit, when a dog moves its tail from side-to-side. Now, the natural assumption is that a dog wagging its tail is happy, but that isnt necessarily true. As science has shown, it really all depends on how fast the tail is moving, and to which side it shows a bias.
If the tail is moving more strongly to the dogs right, then that dog is showing positive emotions, like excitement or interest. But if its moving more to the left, its showing negative emotions, like anxiety, fear, or aggression. From a biological standpoint, this makes sense. Thats because in many animals, including dogs and humans, the left side of the brain deals with positive behaviors while the right deals with the negative. Since each side of the brain controls the opposite side of the body, this leads to a difference in meaning exhibited by the bias of the wag.
By the way, this wiring of the sides of the brain doesnt change between people or animals that are right or left handed/pawed.
Context is key
So put it all together, and we get this. If a dogs tail is mostly wagging to their right and is at or lower than its normal position, then the dog is saying, Hey, Im happy. Youre the boss. Its all good. But if the tail is wagging to the left, and especially if its at or higher than its normal position, then the dog is saying, Bring it. Im in charge here.
Speed plays a role
The one other factor to consider is the speed of the wag. The faster the tail is moving, the higher the positive or negative energy. Really fast and low to the dogs right, really submissive dog. Really fast and high to the left, walk away. At its most extreme, the tail can appear to be vibrating instead of wagging. This is definitely the dog to avoid.
No matter the position, though, a slow moving tail indicates a calm and curious dog, and thats the dog you can safely approach and get to know better.
NB: its the dogs right or the dogs left.
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