Dog Training Collars

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why dogs are wearing these special collars for training and how can i train my dog like a police dog?

Collar: http://cgi.ebay.com/2IN-WORKING-DOG-TRAINING-COLLAR-POLICE-K9-SCHUTZHUND_W0QQitemZ140238116245QQcmdZViewItem

Training: http://leerburg.com/k9training.htm

Remote Trainer Review - SportDog SD-1825


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