I talk to a lot of people about their dogs
Most people think that when their dog wags his tail he is happy
You need to learn ‘tail’
The neutral or natural position of your dog’s tail will vary depending on his breed but most dogs have tails that hang down when they are relaxed. But some dogs, like Beagles, hold their tails higher as a normal position and some, like Spitz breeds have tails that coil tightly against the body and don’t have as much movement so you need to learn to speak tail by watching your own dog. It will help you no end assessing your dog when they approach another dog and in all kinds of situations to keep you both out of trouble.
So, what do we look for in a tail wag … height, speed and direction
Excitement; Generally, the faster the wag, the more excited the dog.
Insecurity; A dog that is tentative about meeting a new person or another dog may wag his tail ever so slightly to indicate that he is insecure.
Even the direction of the wagging can be important. Studies show that dogs wag their tails to the right when they are happy or confident and to the left when they are cautious.
…. and the reason for this fascinating wag fact …
It is because the left side of the brain controls movement on the right side of the body and vice versa. So the left brain is engaged when the tail wags to the right and the right brain causes the tail to move to the left. Since the left side of the brain is associated with positive feelings like love and serenity, a happy dog wags his tail to the right whilst the right half of the brain is associated with negative feelings like fear and depression, so a cautious dog wags his tail to the left.
So watch your dog, read his tail and understand him a little better