Chain Chomp
The Bow-Wow is a version of the chain chomp from Super Mario Bros. It is found in A Link To The Past and Link's Awakening. The the latter game, Madam MeowMeow is the owner of Bow-Wow. She lives in Mabe Village and after completing the Tail Cave dungeon, Bow-Bow is kidnapped by a gang of Moblin. Link rescues him and uses him to enter the second dungeon, Bottle Grotto.
Bow-Wow eats any enemy that stands in Link's way.