Why do some other animals like cows or dogs or cats have spots, but humans don’t?

Question

Basically, why arent’s there any people with colouration like tortoiseshell cats, Dalmatian dogs, or Holstein cows?

In: Biology

Answer 1

We do!

Sort of.

Something called [Blaschko’s Lines.](https://en.wikipedia.org/wiki/Blaschko’s_lines)

They are invisible under normal circumstances.