Puppy Growth Program

Safety That Grows With Your Puppy

Puppies grow fast, but their safety in the car should not have to wait until they are fully grown.

The Optimus Gear Puppy Program gives your puppy access to the right size Defender Harness System through each growth stage, without making you buy a brand-new kit every time they size up.

You start with the system that fits your puppy today. As they grow, they move through the sizes they need. Once they reach their final adult size, they receive a brand-new Optimus Gear harness kit in their final size and colour choice.

How It Works

1. Start With the Right Fit

Choose the starting size that best fits your puppy today. If you are unsure, we can help confirm sizing with photos, measurements, or a quick video.

2. Use the Growth-Stage Kits As They Grow

Your puppy will use the included growth-stage harness kits as they move through the program. These kits may be gently used, inspected, maintained, and approved by Optimus Gear before being sent out.

This lets us reduce waste, keep the program more affordable, and still make sure your puppy has the correct fit as they grow.

3. Request the Final Adult Kit When They Are Ready

Once your dog is close to their final adult size, we ship their brand-new adult Optimus Gear harness kit.

Their final adult-size kit is new, yours to keep, and available in your choice of colour.

What’s Included

Every Puppy Program includes the harness systems needed for your selected size path.

Each harness kit includes:

✔ Defender Harness
The properly sized harness for that stage.

✔ Upper Tether
Attaches to the seatbelt as part of the vehicle safety system.

✔ Lower Tether
Helps keep your puppy stable and properly positioned during travel.

✔ Leash Converter
Allows you to easily connect a leash to the harness outside the vehicle.

Why This Program Works

Because we make the harnesses ourselves, we can inspect, repair, and maintain them properly instead of treating every size change like a brand-new purchase.

We sew, machine, inspect, assemble, and repair our harness systems in-house. That gives us control most companies do not have.

Instead of making every puppy family start over with a brand-new kit at every size, we can maintain growth-stage kits, reduce waste, and keep the program easier on your wallet.

Bottom line:
Premium safety. Less waste. A better way to grow.

Built for Real Puppy Life

Puppies chew. We planned for that.

Normal puppy strap chewing during the growth-stage portion of the program is covered. Because we make and repair our harness systems in-house, we can repair or replace damaged straps when needed.

Heavy damage to the chest or back panel may require review, but normal strap chewing is part of the program.

Full Refund Available

If the Puppy Program is not the right fit for your family, you can return the growth-stage kits for a full refund before the final adult kit ships.

Lifetime Crash Replacement Guarantee

If a Defender Harness System is involved in a vehicle collision, Optimus Gear will replace it and cover shipping both ways.

You are covered in the event of a crash.

Questions Before You Enroll?

Not sure which size to start with?
Not sure how big your puppy will get?
Not sure when to request the final adult kit?

You do not have to guess on your own. Send photos, measurements, or a quick video and we will help confirm the fit.

Start With Safety From Day One

Give your puppy the safest start possible in the car, with a system designed to grow with them.

Start with the right fit today, move through the stages as they grow, and finish with a brand-new adult Optimus Gear harness kit built to last.

Try it at home and make sure it works for your dog.

If it is not the right fit, you can return it within 60 days.

We will also work with you to adjust sizing or setup before you need to return it.

View full return policy

Canada: Free shipping

International: If an estimated shipping cost is not displayed at checkout, please email contact@optimusgear.com for a quote.

U.S. Shipping Update

New U.S. tariffs may apply to certain Canadian-made products, including dog harnesses. We temporarily paused U.S. shipping because we did not want customers receiving unexpected charges when their orders arrived.

U.S. shipping is now available on a limited test basis while we verify our automatic duty calculations. Any estimated duties and import taxes will be shown at checkout. During this testing period, Optimus Gear will cover any unexpected difference in duties assessed after purchase.