Actually I think this thread should remain unlocked. I personally do not and nor have I ever "chained" my dogs on my property, however, I support owners who do for these reasons among others:
1. Neglectful owners will neglect animals regardless of how they are confined. At least if we can see them on a chain, any ill or injured animals can be reported. I actually had an experience where we rescued a chained Siberian from starvation. Unfortunately we missed the 20 or so cats locked in the basement until the tenant moved out. By then we were only able to recover about 8. The rest were dead and being consumed by the living animals.
2. There are many different circumstances under which a dog may be chained. For example, my late aunt used to chain her chihuahua mix on her porch for a few hours a day so that he could enjoy the outdoors. He was a biter and could not otherwise be kept in the backyard, so chaining responsibly prevented bites and his accidental death on her busy road.
3. Sled dogs on chains may actually self-exercise more than kenneled dogs and seem to interact better with their environments. Kenneled dogs have an obstructed view. In addition, some kenneled dogs can become fence fighters and may require solid barriers between kennels further reducing social interaction and visual stimulation.
4. A dog on a 5 foot chain who freely exercises himself in a circular pattern actually has an 11 foot diameter usable space (allowing for the width of the dog to be 6 inches). This is more unrestricted space than a 10 x 10 foot kennel which contains corners that a dog can't easily get his body into.
5. Unchained, unkenneled dogs are at risk of breeding, fighting, escaping, chasing livestock, harassing neighbors, disease, physical harm, theft, etc.
6. Responsible owners should have the right to determine the method of restraint that is the most appropriate and humane for their individual situation.