Two blondes get a horse

Two blondes get a horse each.
-"how will we tell who owns which?" Asked blonde 1.
After a long time of thinking blonde 2 said,
-"I'll cut the tail on my horse so then we'll know!"
Next day both horses are missing a tail.
-"how will we tell which is which now?" Asked blonde 1.
Blonde 2 was thinking again for a while and said,
-"I'll cut an ear on my horse so then we'll know!"
The next day both horses are missing an ear.
Blonde 1 asks blonde 2,
-"how Will we tell which is which now?"
-hmm... I'll take the black one, you take the white one"