As far as I know there is none that supports cockfighting on crypto based casinos, sorry to burst the bubble for you.

But if you are looking for none crypto casinos, there are a lot, but it is supposedly local though. So if you are outside of the country then I don't think you can bet or even access the online cockfighting site as it might detect your IP although you can get away with it by using VPN, but I don't recommend it.