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Measure rear-leg height with the dog lying on its side, from the upper leg’s fold to the toe pad, keeping the leg naturally bent — then match that number and your dog’s weight to the manufacturer’s size chart.
Here’s what to measure, how Walkin’ Pets turns those numbers into a frame size, and the fitting mistakes that send people back to the order page.
How Do You Measure Rear-Leg Height and Armpit-to-Rump?
Lay the dog on its side and measure from the top of the rear leg, where it folds into the body, straight down to the toe pad — leaving the leg in its natural bend. For dogs under 25 lb, add one more measurement: armpit-to-rump (ATR), taken from just behind the front leg straight back to the end of the body.
Two rules trip people up here. Don’t stretch or pull the leg straight, and don’t measure a standing dog — Walkin’ Pets specifies the lying-down position, and a stretched leg reads longer than the frame will actually allow. On ATR, stop at the rump and leave the tail out of it entirely.
Weigh the dog on a proper scale rather than guessing. Weight and rear-leg height together narrow the field; for small dogs, ATR confirms the length of the frame. Enter all of it into Walkin’ Pets’ SureFit Calculator, which also handles the cases where a published chart and a product listing disagree.
Walkin’ Wheels Sizing: Weight Ranges and Rear-Leg Heights
Walkin’ Pets sorts its standard rear-wheel chairs into five weight classes, and rear-leg height picks the strut and wheel combination inside each class. The table below shows the published ranges for the two ends of the lineup.
| Model | Weight and Rear-Leg Height | Listed Price |
|---|---|---|
| Mini | 2–10 lb; smallest frame in the lineup | $240.99 |
| Small | 11–25 lb; 3–6 in uses a 6-in strut and 4-in wheel, 7–8 in uses a 9-in strut, 9–13 in uses an 11-in strut | $350.99 |
| Medium | 26–49 lb | $493.99 |
| Medium/Large | 50–69 lb | $548.99 |
| Large | 70–180 lb; 14–16 in uses a 9-in strut and 12-in wheel, 17–19 in a 12-in strut, 20–22 in a 16-in wheel, 23–25 in a 15-in strut | $581.99 |
| Full Support (4-wheel) | Small from $539, Medium $724, Medium/Large $774, Large $916.99 | From $539.00 |
| Front-wheel attachment | Small $220, Medium $275, Large $305 | $220.00 |
Prices are current listings and can move. The Small product page also lists a second set of ranges (6–8, 9–11, and 12–15 in) for the 15–25 lb bracket, which is exactly why the calculator should have the final say over any single chart.
Rear-wheel chairs support the hindquarters. Front-wheel attachments and full-support four-wheel models exist for dogs needing front-leg or whole-body help — a different purchase entirely. If you’re still deciding which configuration fits your dog’s condition, our tested dog wheelchair comparisons and picks walk through the categories before you commit to a size.
How Should the Wheelchair Fit Once It Arrives?
A correct fit leaves roughly 1 inch of clearance on each side between the dog and the black knuckle or frame area, with the harness holding the hindquarters up without pressing into skin. Add or remove adjustment until the dog moves naturally and the frame doesn’t rub.
Check the fit again after the first few sessions, not just on delivery day. Watch for three things: redness or worn fur at contact points, a frame that tips or wobbles, and whether the dog can urinate and defecate normally while in the chair. Any of those means the size or adjustment is off.
Skip the wheelchair and call your veterinarian first if your dog has open wounds, active pain, a recent surgery, or a neurologic condition that hasn’t been diagnosed. A chair supports a dog with stable weakness; it doesn’t fix a medical problem, and a rehab professional is the right person to weigh in on positioning for those cases.
Common Questions
Can I Size a Wheelchair by Weight Alone?
No. Weight narrows the field to one of the five Walkin’ Pets categories, but rear-leg height decides which strut and wheel combination you get inside that category. For dogs under 25 lb, armpit-to-rump length is a third required number, so weight alone will leave you guessing.
What Happens If I Measure the Leg Stretched Out?
You’ll order a frame that’s too tall. A stretched rear leg reads longer than a naturally bent one, and the extra height pushes the dog’s hindquarters up out of position. Keep the leg relaxed in its normal bend, measure from the fold at the top of the leg to the toe pad, and let the calculator confirm the number.
Do I Measure My Dog Standing or Lying Down?
Lying on its side. The manufacturer specifies this position for rear-leg height, and a standing dog measures differently — the leg carries weight and the joints sit at another angle. If your dog won’t settle on its side, get a second pair of hands rather than measuring upright and hoping the difference is small.
Sources
- Walkin’ Pets. “Walkin’ Wheels SureFit Calculator” The manufacturer’s sizing tool, referenced for measurement input and final size selection.
- Walkin’ Pets. “Walkin’ Wheels SMALL Dog Wheelchair” Source of Small-frame rear-leg-height ranges, strut and wheel pairings, and listed price.
- Walkin’ Pets. “Dog Wheelchair | Adjustable Dog Wheelchair” Source of model categories, weight ranges, prices, and front-wheel and four-wheel options.