From Living Well Magazine: The original animal that we know of that was treated with acupuncture in China was the horse. Today acupuncture is practiced on horses, dogs, cats, rabbits, hamsters, gerbils, chinchillas, pigs, sheep, goats, cows, ducks, various birds, and even exotic mammals.
Read the Q & A here: http://livingwellmagazine.net/2009021284/health/pet-health/ask-the-vet/veterinary-acupuncture