The sickle tail is the single phenotypic characteristic that seems to separate dogs from wolves. Dogs who have tails tend to have an upward curve in the tail, which is called the sickle tail. Wolves' tails, on the other hand, hang straight; this is called the brush tail—similar to that of a fox.
Famous quotes containing the word tail:
““And how do you know that you’re mad?”
“To begin with,” the Cat said, “a dog’s not mad. You grant that?”
“I suppose so,” said Alice.
“Well then,” the Cat went on, “you see a dog growls when it’s angry, and wags its tail when it’s pleased. Now I growl when I’m pleased, and wag my tail when I’m angry. Therefore I’m mad.””
—Lewis Carroll [Charles Lutwidge Dodgson] (1832–1898)