A father bought his two sons two horses. The boys were very pleased with the gift and amicably chose one each. But they thought how to tell the difference.
One boy thought I know we will cut the mane on mine that will do it. And for some time it worked until the mane grew back.

The other boy thought I will cut the tail of mine and agin it worked until it grew back.

After days and days of thinking it over they decided to measure the horses. And it worked the black horse was one hand bigger than the brown one.