Cock fighting is a kind of gamble that bet is placed on the two cocks whereby if cock A wins all cock A supporters wins. It is a legalize gamble in some part of Asia
In the westside of my country during sallah, the Muslims buy rams for celebration, if the ram is bought before the day it will be slaughtered, one of the youth in the family will secretly take this ram out to the field were other Muslim people are with their rams for gambling.
It use to be fun when you see this ram nodding themselves to the extent that some rams might even die at the process of fighting and some rams will lose their horns. Money is been made at this period because so many gamblers will go there to stake on a ram in other to make profit
This kind of gambling is always fun because these animals fights in the circle of human, have you been involved in this kind of animal gambling or have you watched such game before. Can such game be in the casino?
So basically the real life equivalent of pokemon. Except more brutal and less exciting. Not that I have anything against a digital version. Hell, why not just play Pokemon and fight Pokemon? It is basically the same thing and you don't need to kill chickens for it.
To answer your question, I think such a game cannot be installed in most casinos due to laws. But there are countries in which they could exist in casinos, I am sure. But they can definitely find a crowd in online casinos. But then again, that would just be Pokemon. Maybe that's the reason casinos do not include this in their gambling games?