I used to be at a yard that had a firehose for bathing & a lot of the horses loved it! You did have to be sensible as it was very powerful - on full setting I actually couldn't hold it & you wouldn't point that at anyone or anything - but on low settings it was brilliant. I took hardly any time to completely rinse out shampoo, so good for fidgets, & in the summer there was more than one horse that would stand with eyes nearly shut leaning into the water. Interestingly some would happily be hosed with the firehose but not a normal one - maybe the higher pressure water tickled less?