I found these gun textures. This could possible mean pets could fight each other or Preston is working on a new game.
https://www.roblox.com/library/2566237565/Handmade-Sniper-TX https://www.roblox.com/library/2571449968/Snowball-Blaster-TX https://www.roblox.com/library/2571356198/Handmade-Sniper-TX-redo https://www.roblox.com/library/2566238481/Scope-TX
UPDATE: This tweet from the creator of the game tweeted a clue that pets might be able to fight each other. https://twitter.com/Prestuun/status/1063566825043238912