So.. Where Do We Go Now...

A blonde goes to visit her neighbour and wails "I just got two horses and I can't tell them apart!"
Calming her down, her neighbour says "well, why don't you nick the ear of one of the horses and use that to tell them apart?"
"That's a good idea," she says, and goes home and does that.
The next morning when she wakes up, both horses have their ears nicked! She runs back to her neighbour again and tells him what happened.
"Why don't you cut the tail of one horse shorter?" he suggests.
"That's a good idea," she says, and goes home and does that.
The next morning when she wakes up, both horses' tails are the same length! She runs back to her neighbour again, bawling her head off.
"Why don't you measure both horses and see if one is slightly taller than the other?" he suggested.
"That's a good idea," she says, and goes home and measures both horses.
The next morning when she wakes up, she measures the horses again, then runs back to her neighbour. "You were right!" she exclaims. "Your idea worked! The black horse is slightly taller than the white one!"