The Defender is a complete vehicle restraint system, not simply a walking harness with a seatbelt attachment.

It uses two connection points inside the vehicle to help manage your dog's movement during sudden stops or a collision. The system includes the Defender Harness, Upper Vehicle Tether and Lower Vehicle Tether, so the pieces are designed to work together.

It was built specifically around one goal: helping keep dogs safer in the vehicle without making everyday travel complicated.

Yes. Our XS through Large sizes have all passed the same dynamic crash tests used for child car seats, helping ensure the harness performs as intended during real-world collisions.

Our XL size is scheduled for testing in our next round of crash testing. In the meantime, it has undergone extensive static strength and pull testing to verify safety and structural integrity.

Every size is developed using the same design principles, materials, and safety standards, with testing used to confirm performance, not assumptions.

A single attachment point has to manage the dog's movement and restraint forces by itself. The Defender is designed differently.

The upper and lower vehicle tethers work together to distribute restraint forces across two attachment points. During sudden forward movement, the lower tether stays engaged to help control how far the dog can travel forward, while the upper tether works as part of the complete restraint system.

The result is a more controlled restraint system designed specifically for vehicle travel—not simply a strap connecting your dog's harness to the car.

Absolutely. The Defender harness is built for both in-car safety and everyday walking, so you don’t have to swap gear between home and travel. It’s designed to be comfortable, intuitive to put on, and supportive for normal movement, yet engineered to handle the intense forces of sudden stops and crashes.

This dual-purpose approach eliminates hassle while ensuring safety where it counts.

Every Defender System includes the pieces needed to use it as intended in the vehicle:

• Defender Harness
• Upper Vehicle Tether
• Lower Vehicle Tether

Your dog's size determines how the system connects within the vehicle, and instructions are included to help you set everything up correctly.

Almost certainly. The Defender was designed around the seat-belt and child-restraint anchorage systems already built into modern passenger vehicles.

Most passenger vehicles made for the Canadian and U.S. markets after 2004 already have the attachment points needed to install a Defender—there is normally nothing to add or modify in your vehicle.

The exact setup depends on your dog's harness size and which seating position you choose to use.

If you have an older or unusual vehicle, or you simply want us to double-check before you order, send us your year, make and model and we'll confirm the setup with you.

If your Defender Harness System is involved in a collision, do not continue using it without contacting us.

Defender systems are backed by our Crash Replacement Guarantee. Contact Optimus Gear after the collision and we'll help determine the next steps and get your dog's restraint system replaced when applicable.

We never want someone continuing to use safety equipment that has already been through a crash simply because replacing it feels too expensive.

Because it isn't a basic dog seatbelt.

The Defender is a Canadian-made restraint system built from heavy-duty materials, specialized hardware and multiple vehicle attachment components. It is manufactured by Optimus Gear in Winnipeg and has undergone dynamic sled testing.

Most importantly, you're buying the entire system—not simply a strap that clips between your dog's harness and a seatbelt buckle.

For something we hope you will use on every drive for years, we chose to build it around safety, and durability rather than trying to make the cheapest restraint possible.

That was part of the design from the beginning.

The Defender uses a structured body with padded contact areas while still allowing your dog to, sit and lie down normally when properly fitted.

It isn't intended to immobilize your dog in the car. The goal is to provide a practical amount of everyday movement while limiting excessive movement when it matters.

Contact us.

We offer a 60 Day Fit Guarantee, and we would rather work with you on fit than have a Defender sitting unused because something doesn't feel right.

Send us photos of your dog wearing it and we'll help you determine whether it needs an adjustment, a different setup or a different size.

The Defender Harness System is made in Winnipeg, Manitoba, Canada by Optimus Gear.

We manufacture the harnesses ourselves rather than simply importing a finished restraint and putting our name on it.

That also means when you contact us with a fit, repair or vehicle question, you're talking to the people who actually make the product.