This picture says it all. A recent article discussed how wheelchairs are being built to help disabled dogs.
According to the article, the motives are quites simple. "A growing number of pet owners are turning to custom-built wheelchairs to restore mobility to furry friends whose legs, hips or backs don’t work. The owners’ goals are simple: to reward their pets’ unconditional love with whatever it takes for the animals to live normally."
To read the entire article, http://www.msnbc.msn.com/id/23792467/