According to Sanrio, the mouthless Pochacco is also known as "The Yorimichi Dog", "The Amazing Super Pup" and "Street Dog Extraordiaire". Here's the official info. from the Sanrio site:
Pochacco is the most popular purebred in the neighborhood. This sports-minded pup is the best three-on-three basketball player on the playground and a not-so-shabby soccer goalie, too. He’s a real original—how many vegetarian canines do you know? Pochacco loves carrots but banana ice cream is his all-time favorite!