This is not legal in most places but theres talks of other animals fighting so why not ask.
I know it is popular with Bitcoin and gamblings.
Depending on the legality of the game. But right now, it is deemed to be cruel for animals to do a dog fight and is illegal for some reason. Maybe a cockfight will do but not a dogfight.
Dog have some rights from other side of the world, so it's really depends from legality of the game, if the government do allowed this and let gamblers to bets for sure people from that place still have interest, we do have different view about this kind of gambling practice for me I'm not going to enjoy seeing a good buddy fights for life for the sake of money.