Cluck, Buck and Muck

Topanto is a Japanese manga series written by John Ashu (under his pen name, Tezuka Fujiko Fujio) and illustrated by Koji Aihara.

Plot
Jacaro is an unlucky and miserable 10-year-old boy who is terrible at everything as he always gets bad grades and he is always bullied at school. One day, Jacaro was given a Topanto named Rikit who has a body of a Beaver, Wings of a Bird, 2 different tails of a Cat and Dog, Oval-like fangs and 2 different ears of a cat and dog, Rikit was given to Jacaro one new year's eve so he can have a perfect future but Jacaro was warned that Rikit can't wish for money or for anyone back from the dead. Jacaro is also told that he can only have Rikit for 20 years and that when 20 years has passed, Rikit will leave him forever.