Underdog (2007)

After an accident in the mysterious lab of maniacal scientist Dr. Simon Barsinister, an ordinary beagle unexpectedly finds himseld with unimaginable powers and the ability to speak. Armed with a fetching superhero costume, Underdog vows to protect the beleaguered citizens of Capitol City, and, in particular, one beautiful spaniel named Polly Purebread. When a sinister plot by Barsinister and his overgrown henchman Cad threatens to destroy Capitol City, only Underdog can save the day.