I was going through some of my photos at Flickr and ran across this shot of Emma and the cats. Click the thumbnail to view the original. Dogs are just gross. But, when you think about it, so are humans. We might not lick our nether regions (though you know some people would if they could – blech!), but we have plenty of other nasty habits.
Our interpersonal habits are the foulest. If we showed the simple, unconditional love that our canine companions do, life would be happier. This would have to be balanced with common sense, though, because a dog will lick the very hand that beats it.