Originally Posted by Colliepoodle

It's dominance. Your puppy is one step away from murdering the whole family in their sleep. Do not let his cute appearance deceive you; he may be small but dogs spend their entire lives plotting a takeover and unless you put a stop to it RIGHT NOW you will wake up one morning and find you are beneath your puppy in the pack structure.

I won't horrify you with the details of what happens when your dog is pack leader. Suffice to say it isn't pleasant.

Every time the puppy humps your foot, pretend to eat a biscuit. That'll do the trick.