A blonde had two horses, but she couldnt tell them apart. So she asked her neighbor for advice. He suggested that she cut the tail off one of the horses.

This worked until the other horse snagged his tail on a fence. So the neighbor suggested notching one of the horses ear.

This worked until the other horse snagged his ear on a fence. So the neighbor suggested measuring the heights of the horses.

And sure enough, the white horse was two inches taller than the black horse!