Disclosed is an improved dog vehicular restraint comprising a loop end, a fastener end to connect to a dogs existing harness, an adjuster to vary the length, and a construction capable of restraining a dog during abrupt movements such as sudden stops, acceleration, or change in direction. In particular, the improved device is suited to smaller dogs with more sensitive bone and soft tissue structures, and typically use a more custom fitted harness. The device allows for use of the existing harness and the inherent safety features of a typical car seat belt, such as an automatic locking retractor. Also, the device is designed to promote convenience, which increases the likelihood of use, and thus promotes dog and passenger safety in vehicles.