Agree with @NittyOne . I just checked their website and there is nothing about Horse or Dog racing. I will check when I'm there in two weeks and positively verify.
They have kiosk stations with everything possible for football but didn’t look at tabs to see other sports if any. In two trips, both during a football game, I saw little else other than preview of the master’s in little screens about 12’ diagonal.
A quick google search returned this. https://www.circalasvegas.com/blog/horse-racing-sports-betting-tips/ From everything I could see didn’t seem like they had anything tailored to horse racing. I almost if maybe they converted the book at GG to a race book??? Worst case I believe GN has a full race book.