Defender Harness System

One harness.
From daily walks
to car rides.

The Defender is a dog harness that connects to your car using two included tethers to help control your dog’s movement in a collision.

Heading out for a walk? Use the free leash converter with the same harness.

Made by us in Winnipeg, Canada.
Shop the Defender See how it works

SHOP THE DEFENDER

Their everyday harness. Your go-to travel gear.

HOW IT WORKS

From the sidewalk to the back seat.

Your dog wears the same harness for walks and car rides. The included attachments let you switch between the two.

Defender Harness vehicle tether clipped to a dog's harness in the back seat

If you’re ever in a crash, we’ve got you.

If your Defender is involved in a vehicle collision, we replace your system.

No cost. No hassle.

You’ll speak directly with the people who designed and built it.
View our Crash Replacement Guarantee
Fit Reassurance

The right fit starts with
a little help.

Not sure which size your dog needs? Our team can help you choose a Defender and understand how to set it up.

With our 60-Day Fit Guarantee, you have time to check the fit at home. If something isn’t right, talk to us—we’ll help with sizing or setup and explain your return options.
Shop the Defender Get help with fit
Defender Harness being sewn on an industrial sewing machine in Winnipeg
Made in Winnipeg

Made by us. For life with your dog.

Every Defender System is sewn, machined and assembled in our Winnipeg workshop.

From the fabric to the hardware, we’re hands-on with the gear we make. And when you have a question, you can talk directly to our team.

Canadian-made gear. Personal support. Wherever you head together.
Meet Optimus Gear

FAQs

Is the Defender a walking harness or a car harness?

Both. Your dog wears the Defender for walks and car rides. Use the leash converter for walking and both vehicle tethers for car travel.

What comes with the Defender System?

Everything for walks and car rides:

  • Defender Harness: The wearable harness for walks and car travel.
  • Upper Vehicle Tether: Connects the harness to your vehicle’s seatbelt.
  • Lower Vehicle Tether: Helps position your dog in the seat.
  • FREE Leash Converter: Connects your leash to the harness for walks.
How does it connect to my car?

Step 1: Attach the Upper Tether

Open the carabiner on the Upper Tether and clip it around the active (moving) portion of your vehicle’s seatbelt.

Close and lock the carabiner fully.

Step 2: Secure the Lower Tether

The installation method depends on your dog’s harness size.

For XS, Small, and Medium Harnesses

Insert the seatbelt receiver on the Lower Tether into the seatbelt buckle, just like buckling your own seatbelt.

  • The vehicle seatbelt itself should remain unbuckled
  • You’ll hear a click when it’s properly engaged

For Large and XL Harnesses

Locate your vehicle’s child seat anchors (UAS / LATCH anchors) in the back seat.

  1. Place the UAS connector over the metal anchor bar
  2. Pull firmly toward you until it locks into place
  3. Repeat on the other side

You should feel both connectors seat securely.

Step 3: You’re Ready to Ride

Once both tethers are secured, your dog is safely installed and ready for the drive.

Before driving, always double-check that all connectors are fully locked and secure.

Prefer to Watch Instead?

If you’d rather see the installation step by step, watch our short setup video below:

▶ Watch the Installation Video

https://youtu.be/Aq2umgMay0g?si=7JmCKoCysYfJOznO

Download the Defender Harness Installation & Use Instructions (PDF)

Can my dog sit or lie down while connected?

Yes! The Defender harness allows your dog to sit or lay down comfortably while still being securely restrained. The lower tether helps keep them stable, preventing them from shifting too much during the ride. This setup ensures both comfort and safety.

Can I use it in more than one vehicle?

Absolutely! If you frequently switch between vehicles, we recommend using a second tether system instead of purchasing multiple harnesses. This allows for quick and easy transitions while maintaining safety.

What if I’m unsure about the fit?

Not sure which size your dog needs? Our team can help you choose a Defender and understand how to set it up.

With our 60-Day Fit Guarantee, you have time to check the fit at home. If something isn’t right, talk to us—we’ll help with sizing or setup and explain your return options.

What happens if my Defender is involved in a crash?

If your harness is ever involved in a vehicle collision, we will replace it.

We will also cover shipping both ways.

We may ask for a few details about what happened so we can continue improving the system.

Learn more about our crash replacement guarantee

For the drive there,
and the walk when you
arrive.

One harness for both, with two vehicle tethers and a free leash converter included.

Made by us in Winnipeg, Canada.
Shop the Defender Questions?

Talk to our team