Pictured below is Jackson named after singer Michael Jackson  is a 60-pounder like Pork Chop, and above is Fergie, which is the lightest  at about 45 pounds and the only female in the group.

Last year Jackson had to get treatment for a damaged ACL (yes, apparently dogs have ACL problems as well), but he’s rebounded into fine running and jumping form.
“He goes all day and doesn’t stop,” said Dan Beckstrom, Jackson’s self-described dog grandpa. “But I’m interested to see if he’ll go in a straight line.” lol

There is no wagering on the bulldog races (not officially, anyway), though these types of sideshows have become part of the program at Canterbury in recent years. 

They plan on having other races as well with ostriches, zebras, camels and wiener dogs.
For now, though, bulldogs take center stage.
“He loved it,” Berg said of Pork Chop’s romp last year. “He had so much fun. … He felt like a superstar for 
 a day.”

Here is a clip from last years Canterbury's Bulldog race