Welcome to the website of Central Pennsylvania's Dog Trainers Jim Walstrom and Terry Walter. We hope you find the information here helpful and informative in making your desision on which training you choose for your dog. DUAL PURPOSE DOGS can be provided with skills combining elements of expertise. These dogs are fully trained Police Patrol K9s who are also trained in the detection of Narcotics OR Explosives. With over 25 years of training experience you will have the best training possible for your K9.