Why do the animals keep Jones' gun after the battle of cowshed?

The animals keep Jones' gun after the Battle of the Cowshed as a symbol of their victory and newfound autonomy. It serves as a reminder of their triumph over human oppression and reinforces their commitment to defending their freedom. Additionally, the gun is a practical tool for protection against future threats, embodying their determination to maintain their independence. By preserving the gun, the animals also aim to establish their own authority and ensure that they can protect their hard-won rights.