Doberman Pinscher Breeder Wanted

Hello there, I'm looking for a Doberman bred for protection. I've recently moved to New York and as you can imagine is not the safest place in the world. I work with dogs and had several breeds in the past, right now I have a miniature pincher that the new dog will have to share a house with. The dog must be mentally stable so he can go with me anywhere even at work. It will get planets of exercise, at least 3-5 hours a day. Please get back to me via email (apecide@yahoo.com).