Watching your dog get personal with the new sofa may make you cringe, but it’s normal. For many dogs, humping feels good or relieves stress. It's more commonly done by male dogs, but females do it too, sometimes. It's OK to look the other way in most cases. But if they're humping people, they may be trying to show dominance. Call them off so they don't bother anyone, and talk to a trainer or vet for behavior tips.