Cat deer

The cat-deer is a hybrid creature that lived ten thousand years prior to Avatar Korra's time. Cat-deer are noble creatures that can be domesticated, much like Mula, who belonged to Avatar Wan.

Anatomy
The cat-deer is a four-legged mammal with the build of a deer and the facial characteristics of a cat. Its head and body are covered in fur predominantly light brown in color, while a significant portion of its underbelly and tail are white. The cat-deer's retractable claws are sheathed with skin and white fur around the paw's toe pads. Two white antlers protrude from the otherwise feline head.

Connection
The cat-deer's coloration and overall physiology resemble those of a white-tailed deer, while its facial structure resembles that of a household cat.