My first guess is that maybe they are experimenting with a Covid vaccine for horses.

The other issue might be the same thing they did to the chicken feed last year. They could have changed the formula for the food and added a chemical that's extremely toxic to them.

The other obvious option would be there is someone who is desperate to win and poisoned them.

Every year it seems the deaths of horses at these races is not worth having the event any more. Too many die every year.

I agree with all of them 😎👍