Have you ever played Sleeping Dogs Game? there is a Cockfighting activity in that game which you can bet for two roosters being fought to the death inside a ring.
I tried to bring similar scene to GTA5 just for fun or roleplaying, in the same time i will request if someone is able to make a script like this.
Download here: https://www.gta5-mods.com/maps/cockfighting-funny
If it says still pending be patient.
And this is how it looks like on Sleeping Dogs Game