Bingo had partial hind leg paralysis. Our vet was unable to determine the exact cause of the problem. Unfortunately, his condition worsened in the time we had him so that he want from being able to walk short distances to losing all control of his back legs. We were lucky that Bingo, being a pug, was small and he was able to move around inside by scooting along using his front legs, with the back legs dragging behind. We cleaned his back legs and made him little overalls to wear so that he didn't scrape his legs when he dragged them. We were also lucky we had no rugs, so no rug burn. Of course Bingo, needed away to get around outside so we got him a wheelchair. Due to the seriousness of Bingo's condition we went for a simple model wheelchair that could be made quickly, rather then one of the more expensive and fancier models, as we were afraid that if it took to long to make the chair Bingo might not be around to enjoy it. Here is a video of Bingo using his chair in our back yard on the day it came. (Another lucky break being city dwellers our backyard is concrete since it is also our car port, so Bingo was able to roll around easily).
My experience with Bingo has taught me that dogs with paralysis and other disabilities can do very well with wheel chairs. While I realize it is a very personal decision and every situation is different, I am always saddened when I hear of people automatically putting loved companions to sleep because of compromised mobility or loss of bowel/bladder control. These days there are many options from wheel chairs to doggie diapers to mobility harnesses, that can help dogs with disabilities maintain a great quality of life. Below are some resources:
Dogs With Disabilities
Help 'Em Up Harness