You should know that the tick is a behavioral disorder and a horse that ticks is a bored horse. This may be due to a lack of communication with its fellows, a lack of visibility on the outside, outings outdoors too rare, a work inadequate to its various needs, various pains. Horses living in the meadow can also tick. I know that some people advocate the installation of mirrors in boxes. It turns out that horses spend a lot of time observing themselves in the mirror, therefore it spends much less time to tiquer.
Have a good day :)