Races ? Are we talking horse racing ? If we are talking greyhounds, It wouldn't matter as you can park in the car park. And take the dog out on a lead for a leak.

I used to take a Labrador, (the racings dog travel mate) to all the tracks in Victoria. Between races used to empty her in the car park. The only time I got ticked off was at Warragul by a steward on night.