Biography
Piro is a stray cat which they take in despite Nayuki's allergies, Makoto becomes very attached to the cat and you often see Piro on her head. Piro's name derives from 'Piroshki' (Пирожки [rus]), a Russian word for meat buns - that name was suggested by Yuuichi as a joke but Makoto shortened it to Piro although she had no idea what it meant.
Appearances
Piro FAQ
What anime is Piro from?
Piro is a character in Kanon and appears in 2 titles in total, including Kanon (2006).
What is Piro's Japanese name?
Piro is written ピロ in Japanese.
Where can I watch Piro?
Open the Kanon page for licensed streaming links and the full episode list.