The Hallo-Wiener by Dav Pilkey

Oscar the dachshund is a dog with a problem: it's hard to win doggy respect when your mother calls you "my little Vienna Sausage." Mom's idea of a Halloween costume is a bun with mustard, but Oscar makes the most of the outfit, defeating a monstrous pair of masquerading cats to get his nickname changed from Wiener Dog to Hero Sandwich. Dav Pilkey's wacky humor comes out in both story and pictures--a recalcitrant pupil at school writes on the chalkboard, "I will not sniff my neighbor." Set against a series of vivid, clearly painted skies, the pictures promise a world in which menace is only artificial and underdogs can become wonderdogs. - Mary Harris Veeder - Booklist