A tennis ball that throws itself is a fuzzy creature that hops along on the ground, also known as a "rabbit". Dogs like to chase them. They typically eat (your) vegetals, so the are sometimes the target in a game of gardening.
https://saladfrosting.wiki/wiki/File:Invideo-ai-1080_The_Self-Throwing_Tennis_Ball_A_Furry_T_2023-09-26.mp4