Keeper Collars (martingale and hidden prong collars)
Julius K9 Super Grip Leashes
Redline K9 Sure Grip Dog Leashes
(long lines - purchase a lunge line in the length you desire)
This company also carries dog leashes. We use them to secure our dogs in the backs of our vehicles so they don't jump out when the back end is opened. Make sure the leash is long enough that if the dog does jump out, they won't be hanging from their harness. Always use a harness when securing your dog rather than a collar to avoid choking.