Devildog Dock N Door for all your residential and commercial garage door needs. Loading dock equipment: levelers, Dock pads, truck restraints, and more. Devildog Dock N Door is a veteran-owned and operated company serving Helena, MT, and the surrounding areas. We have worked on residential and commercial garage doors for 28 years. We also specialize in installing and servicing loading dock equipment in Helena, MT, and the surrounding areas.