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The manga centers on a rookie dog trainer named Miyu Samura. Miyu's ex-girlfriend left him with a dog that he didn't really know how to take care of. One day, he meets Shinichirō Niwa, a dog trainer, and the indecisive Miyu's life begins to change. Shinichirō also introduces Miyu to the pet groomer Ritsuka Izumi and the veterinarian Suzunosuke Kubō.
Bow is a stray bull terrier with a distinctive black circle around his left eye. After being adopted by the daughter of a not-so-cool yakuza (Japanese gangster) family, his silliness often turns the house upside down, but the "boss" can barely do anything because Bow is now the pet of his adorable daughter.
Mametarou's life is as good as a dog's can get! With his loving owner Iku, precious girlfriend Hanako, and close network of neighborhood friends, adventure is always waiting around the corner. Yet in between his insecurities about his cross-breed status, a lovesick Iku, and rivals for Hanako's affection, Mametarou's world is a little more complicated than he'd like it to be. With various problems to solve along the way, Mametarou tries his best to be a good pet and, even more importantly, a good friend.
With a hungry girlfriend, a loving owner and a jealous rival, Mametarou the cross-breed dog has a very eventful life! Whether it’s trying to steal some melon pan for sweetheart Hanako or kicking sand in the face of owner Iku’s boyfriend Akihoshi, Mametarou is always ready for his next adventure. School, the convenience store, the park, and his own yard yield many surprises, all of which lead to his ultimate goal: kick the intruder Akihoshi out of Iku’s life once and for all!