Tucker

Tucker is a supporting protagonist in Racing Stripes. He is a Shetland pony who used to help Nolan train racehorses, including Sir Trenton. He presents himself with a grumpy demeanor after years of training ungrateful horses before retiring.

In Racing Stripes
Tucker, having secretly watched Stripes at the Blue Moon Races, approaches him and suggests that he get proper training first before trying to race. Stripes, in need of a rider, chooses Channing and convinces Goose the pelican, to sabotage Channing's motorcycle and Nolan's old pickup truck so that Channing can ride him to her workplace at the Kentucky Open. The plan works, and Channing, with Nolan's reluctant approval, rides Stripes to the Kentucky Open.

When the animals eventually convince Nolan to allow Channing to ride Stripes, Stripes is discouraged, having just found out he's a zebra. Franny reveals to Stripes that Tucker used used to help Nolan train racehorses, including Sir Trenton. Tucker upholds a grumpy personality after years of training horses who never give him any thanks for his help. This encourages Stripes to begin training with Nolan and Channing.

At the end, when Stripes wins the race, Tucker finally gives Goose his approval.