In recent years years, YouTube's collection of doggy welcome home videos has exploded. Before we begin, you might want to grab some tissues.1. PRINCESSThis soldier gets a face-lickingly warm welcome home from Princess, the tiniest dog in our collection.2. EMITT THUNDERPAWSAt the other end of the size spectrum is Emitt Thunderpaws, a Great Dane, who displays uncharacteristic behaviors as he welcomes home his soldier.3.