Kowalski appears as a Weimaraner dog character in the anime series, with his name occasionally transliterated from Japanese as "Kowaruski". He belongs to a diverse group of 48 puppies central to the narrative. Traveling alongside Freddy, a French Bulldog separated from his owner, and other canine companions, Kowalski participates in their quest to find the Fortune Tree. This mission drives the plot, as the tree's survival directly links to humanity's sustained goodwill toward pets. Within an ensemble cast representing multiple dog breeds, Kowalski contributes to the collective journey without individual narrative arcs, background stories, character development, or plot significance beyond group participation. His appearance is specified only by breed, lacking distinct behavioral traits separate from the group dynamic. The character does not feature in supplemental media like movies, OVAs, or spin-offs. In the Japanese version, Shoto Kashii provides Kowalski's voice, consistent with standard practices for supporting animal characters.