This is great for when you are working/training out of your car with multiple dogs. I have used mine for agility and field training. I know people who use them for tracking and search and rescue as well.

FROM CLEAN RUN WEBPAGE

There are many times at trials, and during rest stops on the way to and from trials, that is convenient to leave your dogs in the car. But until now, for the sake of security, the only ventilation you could provide for them is leaving the windows cracked open. The Ventlock Tailgate Lock allows more ventilation into your vehicle while at the same time keeping out all but the most determined thief. Ventlocks work by fixing the rear door or tailgate in a semi-open position. Combined with a front window open just an inch or two, you'll have free-flowing air just where the dogs need it most—on their noses at the back of the vehicle. It takes only a few seconds to fit or remove the Ventlock, and the car can be locked in the normal way, using either the key or keyless locking device. Best of all, the Ventlock fits 99% of estate cars, hatchbacks, vans, and 4-wheel drive vehicles fitted with a rear door. The Ventlock is made from steel and then coated with a tough polymer-based epoxy polyester finish or durable nickel coating. It is incredibly strong and is made to withstand years of hard use. Takes only seconds to fit or remove.

Available in six sizes; select the Sizing tab on the left for help.

Important Note: As dog owners ourselves, we feel duty bound to say that whatever method of ventilation or protection against sunlight you use, there can be no substitute for checking your dog on a regular basis. We recommend that you do not leave pets unattended for long periods in a parked vehicle in direct sunlight. The Ventlock is not suitable for use when the vehicle is moving or when the engine is running.