But one of the things my dog loves to also do is LICK MY FACE as soon as he sees me! My dog is a big boy and can literally knock me down when he jumps on me so I can't help but let him lick my face (especially when I can't stop him from doing what makes him happy). But this got me thinking--how clean is my dog's tongue? Sometimes I walk away and forget to wash my face before I have my dinner. So let's dive down to top 3 facts about puppies' tongues.