http://www.handicappedpets.com/Mobility ... arness.htm
Both of these appear through Handicapped Pets and the articles here might help you out. I'm sure you'll get some help from some members who actually have used these leashes and can answer some of your questions. Good luck!
Rudy couldn't walk at all before his first treatment and then he walked with both leashes for about 3 weeks/a month and the arthritis just crippled him up so badly and the bedsores came the glaze came over his eyes and well - you can read about that on REMEMBER ME too, if you aren't already familiar with Rudy's story. I'm still crying just thinking about it. I miss him so much and it has been 5 months since he is gone on the 17th of July.
Buy the leash. It works and it's well worth the money. It'll save your back and it'll help your dog greatly - but I do advise you to use it in conjunction with a harness or seat belt, like we did. Your pup will look like a giant tote bag when you are using it, but you'll be transporting him/her safely & comfortably and with the soft supports that come with the rear-end leash, if you have a male dog, you don't have to fear the family jewels (we called Rudy's the Dober-mints) will be harmed. And he never peed or pooed on them. Run it by your vet - I did. You'll sleep better that way. Hope my input can help you.
Does your dog use his front legs? if he does I don't see why the rear end leash wouldn't work My dog Eros came home from the hospital and couldn't use any of his legs I used a regular back clipping harness for the front and a crib sheet for the back and that worked for me. He is a GSD and was 65# when he came home from the hospital. If your dog isn't too sensitve the crib sheet is alot easier to handle then a towel even a regular sheet is better for you, but It doesn't provide as much padding as a towel.
We wish you the best of luck!
Eros & Tiffany
Never lose hope, Miracles happen all the time!