Animals don't have preconceived notions about the healthcare modalities they are receiving.
In the 1970's veterinarians used acupuncture for race horses. The results were evident in the times the racehorses turned in for their events. Can't fool the stopwatch. This was one way acupuncture began to get traction in this country. Now veterinarians use acupuncture on all kinds of animals. If you haven't tried it for yourself, see what you are missing out on.