Why does the fur of animals stop growing/shed past a certain length but we have to manually cut our own hairs?

Question

Why does the fur of animals stop growing/shed past a certain length but we have to manually cut our own hairs?

In: Biology

Answer 1

Hair length = growth rate x hair life

So long hair on body either grow fast, or live longer, or both. Short ones, the opposite.

Sometimes you end up with the wrong follicle in the wrong place, like I have a single eyebrow hair that grows like head hair and I gotta trim Joey every week.