Horse racing is the one I am fully aware of and I have seen few casino showcase it here but that of dog racing is what I am yet to see. Where I usually see it is in movies where dog race is the major focus and not in reality. Possibly dog racing might not be recognised or so but I am quite sure in some countries they do it and it is recognised there. Aside it not being common, there is every possibility that the race has some sorts of lapses and likely manipulative as well and also one can not really vouch for what they are gambling for as they do not have clues on the dog they are gambling in their favour. So these factors makes it complex for one to not give in to the dog racing games.
Dogs are not created for this kind, they are a domesticated breed that lives in our house and they have specific characteristics and racing is not part of that compared to a horse which is the first choice for racing, we all know casinos are regulated and will be charged with animal cruelty if they have it in their platform because they are forcing these animals to do what is not on their nature.
Dog racing can be found in remote villages far away from the eyes of authorities and regulators it's better to bet on horse racing it's much easier to bet on horse racing because you can see the factors that will give you winning bets like the breeding of the horses in a race.