Buying a Horse

Lil' Johnny attended a horse auction with his father. He watched as his father moved from horse to horse, running his hands up and down the horses' legs, rump, and chest.
After a few minutes, Johnny asked, "Pop, why are you doing that?"
"Because I'm thinking of buying these horses."
Johnny looked worried, "Then I think we'd better hurry home right away!"
"Why?" his father asked.
"Because the UPS man stopped by yesterday, and I think he wants to buy Mom!"