The case of dogs is not like the humans who feel comfortable even when sitting for long hours.
Unlike people who can merely sit in front of the TV or use the computer all day, dogs are naturally active and they love to wander around and explore as their way to enjoy life. That is why when your dog falls ill or worse becomes disabled, you can feel its sadness deeply over its situation. A paralyzed dog is same as a dead one. It can't go around and therefore can't follow whatever provokes his sense of smell. It is prevented from running and playing with you if it wants to.
In many ways, your dog ceases to have the life of a dog. Being a pet lover, you simply can't take away the happiness from your paralyzed dog. If modern veterinary medicine can find any total cure for the cause of the paralysis or disability of your dog, you must at least lessen its suffering through giving him a means to move around. This you can do by attaching your dog to a dog wheelchair. This contraption can let your dog move around and experience being a naturally playful pet. This could also encourage your dog to exercise its bones and muscles, which is necessary for the rehabilitation of the paralyzed parts and the maintenance of its healthy body parts. However, it is not that your pet would immediately like his dog wheelchair and he would right away run around the place. In fact, this may be uncomfortable for him at first instance. For a short while, you can act as a coach to your dog, motivating it to walk around the place and try the new contraption. This might be a surprise for you to see how your dog responds to your almost-effortless coaching.
What it takes after all is a bit of encouraging and your pet dog to always do what it always wanted to do, which is to roam around the house and the yard to enjoy and to watch over the property at the same time.