The technique used by Green and Hollister is part of a burgeoning field called regenerative medicine, which involves engineering therapies -- using things like stem cells, or "body parts" constructed out of biological material -- to harness the body's ability to heal itself.

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The body harness and head strap had to be as light and unobtrusive as possible too - no mean feat when dogs come in different shapes and sizes, even within breeds.

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One type of therapy used in the study is body-weight-support treadmill training, in which a patient's weight is supported by a harness over a treadmill while therapists help move his legs.

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