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http://koehleracademy.com If you want to stop your dog barking, first you must know the cause of the dog bark. Here are 11 reasons why your dog is barking. Visit our website to learn how to stop dog barking. Harry Quek is mentored and certified by Bill Koehler in the Koehler method of dog training. Harry Quek, with over 30 years of professional dog training experience, is without doubt, the most experienced dog trainer in Singapore.