This is the trailer cart I made for my dog Thunder.
It's a folding bike trailer, I made a harness and rigging for him to pull it places.
Aside from the trailer and green dog harness, which I already had, I spent $18 total to make this rig.
A lot of engineering went into this project. If loaded correctly this produces as little as 1kg of downward force on my dog. The poles are only for weight and steering. The upper leads pull the cart slightly forward and move the centre of gravity for propulsion. My dog also has breaks connecting underneath his body which allow him to stop the cart. Finally thanks to Archimedes; Even a completely unbalanced load of 10 pounds will only exert 4 pounds of force spread over a harness with over 3 ft square relative weight distribution contact in the rigging.
Step 1: The Supplies
- Folding Bike Trailer. I originally purchased mine for groceries and laundry.
- Dog Harness. Originally purchased to roller blade together. Most any decent harness will do. On mine, I added a metal loop to the bottom (for brake lines), and a pad to the top, and that's it.
- 2 poles. These serve two purposes; 1) They transfer weight to the animal, 2) They help the dog steer the cart and provide a "zone". The poles must be strong enough to transfer the weight, but light enough to not affect total mass. I chose 2" bamboo stalks.
- 8 leashes thick enough to be useful.
- 6 collars of the same size as leashes, to be used for their adjusting hardware.
- 2 eye screws, I chose PVC coated for comfort. The key to these is not just the size, they need a flange at the base of the hook
- Electrical / PVC tape
- matching yarn, Acrylic is best.
- liquid fabric glue
- Cheeky Licence Vanity Plate
- Finally, a happy dog.