Yes.
by there fur that keeps them warm and there horns that they use for defense
No, they have hair.
Literally the pelt of a Yak. A Yak is a type of animal, similar to an ox. The pelt would be the skin and fur.
They have long thick fur
Yaks have a very thick fur coat that hangs down to their ankles.
Yaks have hair, it grows naturally
To keep their Yak body warm.
Cats have fur to keep them warm when they are cold.
The wild yaks are killed for the food.They are also killed for their fur.
In Chinese, "yak" is a type of animal known as 牦牛 (máo niú). These animals are native to the Himalayas and are often used for their milk, meat, and fur.
because there fur has blubber in it too keep them warm
It gives them milk,fur,meat and carries heavy loads