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Tuna the hound peeks out from under his blanket. He bares his row of buck teeth.
Courtney Dasher rescued the dog in 2010. The pooch has bug eyes, a big nose and infamous overbite. Today, the dog from California is the most-popular dog on Instagram. That's a social network site.
Pet owners have unleased their dogs on the photo-sharing service. They set up accounts to show Manny the French bulldog wearing spectacles. Or Tuna poking his schnoz out of a suitcase.
Funny pet photos get plenty of play on Facebook and Twitter. Those include "muttbombs." That's where people Photoshop dogs into snapshots of themselves or celebrities.
Dasher says Tuna resembles Mr. Burns from "The Simpsons."
Manny is very popular on Instagram. Amber Chavez of Chicago says her French bulldog looks like a cross between a bunny and a piggy.