Dogs that have realized that they are restricted to the length and entanglement of a chain usually become sedentary and listless while on their chain with intermittent bouts of barking out of frustration and boredom. Many times these dogs bark when their owners are not even home, so they are not even aware of a barking problem . However, in spite of the owner's claim that their dogs are well-adjusted, usually these same dogs are reported to be uncontrollable in normal family situations. Those that are brought inside may demonstrate aggression to other animals and even people that they are not familiar with. Dogs that live on chains have a greater chance of becoming aggressive and unruly.
Dogs are social animals.
I often wonder why a person chooses to have a dog when the dog lives his life isolated on the end of a chain. Ideally, a dog will have access to both the home and yard via a doggie door . The ideal time for a dog to be chained or tethered is when you are at the other end. However, there are times when dogs may be tethered while you are busy but near by. Such situations include a picnic lunch.