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And of all things to hump, why legs, you ask? Well, little known to most, dogs were originally bred as a lower leg cover, because long ago no one could make pants that went beyond the knee. Tailors just weren't that skilled. "Dog" is of the Greek root "dogus" which means "thing that keeps my scandalously exposed legs hidden from the perverted, gawking public." And so, as much I love to judge and scold animals for their inappropriate behaviors, this summer while out at parks and picnics, if your Achilles tendon is suddenly violated by a canine, please cut them some slack; they can't help it.
(flickr photo Down boy! by kennymatic; http://www.flickr.com/photos/kwl/2602576621/)