The adjustable length extenders (sold as a set of 2) connect the front harness in place with the wheelchair. To determine which size extender is needed for your pet, please measure from the back of your pet’s front arm to the end of your pet’s body (armpit to rump).
| Wheelchair Size | Armpit to Rump | Extender Size |
| Walkin’ Wheels Mini | 5.5 – 8.5″ / 14.0 – 21.6 cm | 8″ / 20.3 cm |
| Walkin’ Wheels Mini | 9 – 12″ / 22.9 – 30.5 cm | 11″ / 27.9 cm |
| Walkin’ Wheels Mini | 10.5 – 14″ / 26.7 – 35.6 cm | 13″ / 33.0 cm |
| Walkin’ Wheels Small | 10 – 16″ / 25.4 – 40.6 cm | 12.5″ / 31.8 cm |
| Walkin’ Wheels Small | 15 – 21″ / 38.1 – 53.3 cm | 18.5″ / 47.0 cm |
| Walkin’ Wheels Medium | 9 – 19″ / 22.9 – 48.3 cm | 15″ / 38.1 cm |
| Walkin’ Wheels Medium & Large | 18 – 28″ / 45.7 – 71.1 cm | 26″ / 66.0 cm |
