Works flawlessly, unfortunately is a bit complicated to use. But actually, it's made for people and the well known, hold still. But goes smoothly even with the horse and appropriate inhalation cone. I myself have only tried it on me, the unit is very quiet and efficient. The batteries supplied (original packaging), however, were of no use. I also have batteries that are a little too thick. But is probably due to the battery, the second batch battery fits easily.
