Minecraft wiki entry for Fox, associated text: Wild wolves are aggressive toward foxes when within 18‌[JE only]/16‌[BE only] blocks. In Java Edition, adult polar bears also sneak toward foxes to attack them; in Bedrock Edition adult polar bears attack foxes within 16 blocks. In Java Edition, baby polar bears, though normally passive to players, also attempt to attack foxes within 16 blocks, or when their adult polar bear attacks one.