Zombie Bull
The Zombie Bull is a BASIC pet that was available from the Pumpkin Egg during Halloween Event 2021. This pet had a 56% chance of hatching. It is one of the weakest Halloween pets.
The latest Pet Simulator X value list for Zombie Bull can be found below:

Regular
💎 300

Golden
💎 1,000 (1k)

Rainbow
💎 3,000 (3k)

Dark Matter
💎 10,000 (10k)