The character "Cachorro" (identified as "Xereta" in the Brazilian Portuguese dub and "Pinboke" in Japanese materials) is the protagonist's first animal companion. He appears as a small dog with anthropomorphic traits, including the ability to speak human language and wear clothing, specifically round spectacles. Functioning in a supportive role during the series' initial phase, he provides direct assistance and companionship to the protagonist during missions against the antagonist Spectro and his forces. His demeanor reflects loyalty and an eagerness to engage actively in confrontations, frequently displaying human-like mannerisms and behaviors.

Cachorro's involvement is strictly limited to this early narrative arc. When the series progresses into its second phase, the dog companion is entirely replaced by a young orphan boy named Roko. Following this replacement, the dog character disappears entirely from the ongoing storyline. No details exist regarding his origins, background prior to meeting the protagonist, or fate after being replaced.