Fast and shaky wag

When your dog moves its tail in a fast and vigorous way, it may be because the dog is under some stress or tension. This movement of a dog's tail signifies a highly aroused state.

Tucked in

When your dog is scared or sad, it will stick its tail between its legs. It could also mean that they have done something which you don't approve of, and are feeling ashamed.

Pulled down

Your dog will keep its tail at a low level but not tuck in when it's not entirely comfortable with the situation it is in. The dog could be feeling anxious, nervous, or unsure.

Circular wag

Your dog will most often wag its tail in a circular motion when it is happy or overjoyed to see someone special. It could also mean that a dog is being friendly with you.

Pointing straight up

The dog is alert and aroused and ready to react to whatever it is they're unhappy with. They are trying to convey that they are mad. If you see this stance, beware!