How to Attach a Dog Bike Trailer to Your Bike?

For the full breakdown, see our best Dog Bike Trailer guide.

Attaching a dog bike trailer comes down to three jobs: getting the hitch onto your bike’s rear axle, connecting the tow arm, and securing the backup strap. The exact steps vary with your bike’s axle type, but the overall pattern holds for nearly every trailer on the market, from the PetSafe Happy Ride to the utility-grade Bikes at Work models. Getting it right matters — a loose hitch or a pin left unclipped can end a ride fast.

Where Does the Hitch Actually Mount?

The hitch fits on the bike’s rear axle, not the seatpost, rack, or frame. Most manufacturers specify the left rear axle, and some manuals go further, warning that the trailer should only be used on a bike where the hitch can attach to the axle at all.

You will also need the tow arm that reaches from the trailer to the hitch. The connection is usually a clevis pin secured with a clip, and the safety strap loops through the frame as a backup.

Attaching by Axle Type: Quick-Release, Bolt-On, and Thru-Axle

Your bike’s axle type decides the exact procedure. Here is what each one requires before you connect the tow arm.

Quick-Release Skewer Bikes

Remove the quick-release skewer from the rear wheel, slide it through the hitch, and reinstall it through the hub. Tighten it to the pressure your bike manufacturer recommends. You can check the lever’s tension: it should begin gripping as it moves from open to middle position. If it moves too easily or too hard, adjust the nut.

Bolt-On Axles

Remove the left-hand axle nut, place the hitch over the axle, and reattach the nut. A common failure is a hitch sitting loose because the nut only caught a turn or two of thread.

Thru-Axle Bikes

Thru-axle bikes — common on newer mountain and gravel bikes — need a trailer-specific coupling axle or adapter. These parts are not universal; they must match the thread pitch and length of your bike’s dropout spacing. Check with the trailer manufacturer before buying.