A method and an apparatus are provided for enabling a safe and secure environment for a pet traveling in a vehicle during a collision or sudden breaking of the vehicle by using a seat belt system to flexibly restrain the pet with a safety restrainer or a detachable safety belt. In one embodiment, a safety restrainer may secure a pet in a vehicle having a seat belt with a first seat belt prong that latches into a first seat belt buckle. The safety restrainer may comprise a restraint assembly including a restraint strap removably couplable to a body portion of the pet. The restraint assembly may be positionable about the body of the pet and the restrain strap positionable between a pair of fore legs and a pair of hind legs of the pet. The restraint strap may include a first strap end and a second strap end being releasably couplable to each other such that the restraint strap forms a loop having a hole when the first and second strap ends are releasably coupled together. The safety restrainer may further comprise a harness coupled to the restraint assembly. The harness may be releasably couplable to the seat belt of the vehicle for flexibly restraining the pet. The harness may include a first harness end and a second harness end, wherein the first harness end having a second seat belt buckle for releasably coupling to the first seat belt prong and the second harness end having a second seat belt prong for releasably coupling to the first seat belt buckle.