Dexter Sim is one of the nation's leading innovative Obedience & Agility icon for 21 years. He is a Certified WMA Dog Agility & IAABC-ADT Instructor. Dexter is both an Agility & Obedience Judges. He is also one of the Agility Pioneers for bringing his very own local dogs to compete in the Dog Agility World Championships in 2007.

He has won the OTCh, OBEDIENCE TRIALS CHAMPION & the OTCh Utility, OBEDIENCE TRIALS CHAMPION FOR UTILITY for 6 straight Years (FY 2003-2008). He had titled Four Obedience Trials Champions (OTChs), Two Dual Champions, and Four Conformation Show Champions