Hercules: The Animated Series
Hercules and the Owl of Athens
S1 E14:
Athena, goddess of wisdom, and Ares, god of war, are brother and sister and always bickering and playing pranks on each other. Athena decides her precious wise owl needs protecting from Ares' revenge, and rashly gives him to Herc for safe custody. It's great for his exams, but apart from that the bird causes chaos.