What is the difference between FUR and HAIR ? Why do they say only people have hair?

Answer 1

SA: Is there a difference between hair and fur?
NS: There isn’t. Hair and fur are the same thing.

SA: Why is it then that, for example, my dog’s fur is three inches long and it never seems to grow longer, while my own hair keeps growing and growing?

NS: Actually, a lot of types of human hair won’t keep growing and growing. The normal length of the hair is an individual and species specific trait. So across the breadth of mammals, there are many norms for hair length, or fur length.

What’s really different is the pattern of where it grows. Your dog or cat is basically covered with hair, whereas humans tend to grow hair in a few selected places. And that’s one of the things that have changed through evolution in a number of mammal groups. Whales, for instance, are mammals, but they are nearly hairless. We lack hair over a lot of our bodies.

Answer 2

Pets and animals have fur. People have hair.

Answer 3

There are different types of each. Alot of it has to do with the way it grows (determinate or indeterminate) and it's "set" which is the way it lies. There is also the issue of what it's for: insulation, display, sensory etc.