Here is a doggie support sling I developed a few years ago when one of our dogs, a Weimaraner, met with an unfortunate accident and ended up with several breaks in his pelvis. He needed "rear end help" for several weeks to negotiate. I didn't need a sling again for a few years, then our old gal Sophie (Weimaraner ) started having "rear end issues". She has problems with some discs in her back and one day last summer, when out for a run at a friends farm, she went down on me and she had lost all use of her hind end. Within minutes I had her on her feet and had to use her leash for a sling to get her back to the van. That time she quickly regained the use of her hind end, but it could happen again anytime. However the leash I used as a sling, could NOT have been comfortable for our dear girl. The minute she had been vet checked I came home and made up another sling. I have since made more - one for a friend's dog with spinal issues and more recently I made a couple for our local vet clinic for them to use on dogs in the clinic that needed help.
They are very easy to use - just sling them under the tummy to help support the hind end and walk beside the dog as they move around - whether around the house or out for a potty break. You can keep one hand on the sling and the other on the leash. Pretty easy! They are soft and comfy, made of 4 layers of flannel and a layer of quilt batting. The handles are made the same way. I have just posted one of these slings on my Etsy site.