For anyone still getting an old dog up the back step with a towel held in both hands.
You already worked this out on the third step. The handle belongs at your hip, you stay upright, and what sits under him holds its shape.
You have seen the spec. What is left are the doubts right before you order.
Five reasons His Turn does the job the towel kept failing at, one doubt at a time.

Every product page you found showed a bloke holding a strap up at chest height. That grip hangs the weight out in front of you, where your shoulders and lower back take it.
Two adjustable webbing straps come up to your hand. Set them short and your hand rests at your hip, with his weight underneath it. You stand upright.
"Rolled bath towel: two hands, bent over. His Turn: one hand, upright."
Source: His Turn product page, towel comparison
Four steps in, a rolled towel gathers into a cord under his belly. It digs in, slips sideways, and leaves you holding a towel with better handles.
This wide padded panel keeps its shape under load when he leans into it. It sits across the back of his belly, just in front of his back legs, and spreads his weight evenly.
"The quilted panel spreads his weight across his hindquarters instead of cutting in like a towel."
Source: His Turn product page, How it works
A big old dog is too heavy to carry up a step. He does the rest of the work himself.
You take the last few kilos of the push, through the panel, with one hand. The other hand stays free for the rail or the car door. A towel took both hands and a bent back, five times a day.
Dogs over 8: arthritis in the hip in 36.4%, the elbow in 57.4%.
Source: study of dogs older than 8 years, The Veterinary Journal, 2024Fitting a harness to an old dog is its own job. Leg holes mean lifting him, and bending over, before you have even started.
This one slides under his belly, clips, and you go. The webbing adjusts through metal buckles, so it keeps fitting as he loses or gains condition over the months. When you are done, it folds into a bag.
"Slide it under, clip the buckles, go. No stepping through leg holes, no lifting him to get it on."
Source: His Turn product page, How it worksSizing from a chart is the last thing between you and the order. Measure around his belly at the narrowest point, just in front of his back legs.
Between sizes, go up one, because the straps take up the slack. Send His Turn his measurement and breed and they will tell you the size. A wrong size is exchanged free.
Four sizes, from 44 to 82 cm around the belly, roughly 6 to 41 kg.
Source: His Turn product page, sizing guide
Features a product from His Turn, a brand connected with this magazine. Not veterinary advice.