The following trainers use force, shock, startle and pain to train your dog. They may or may not misrepresent their methods to you when you call, and instead offer a free consult, and say that they would never use anything that hurts your dog.
Sit Means Sit (franchise)
Bark Busters (franchise)
Dog Wizard of Fort Collins (or anywhere, as this is a franchise).
Colorado Dog Training Academy
Black Paw in Louisville/Superior