Sometimes dogs can be just as mean as cats. It doesn't happen very often but when it does it just as usual but significantly funnier. And the victim is usually the smaller/younger of us, which just seems to make it all the funnier.
Case in point? This bastarding mutt, who knows without a doubt what this little nipper is aiming for, and rubs his mobility in his face. Probably getting him back for a lot of fur-pulling and attention stealing.
It's hard being top dog.