Originally Posted by DuckDodgers
Dang, I would have been kicked out of every barn I've been to 10 years ago if folks were actually so strict about using grooming supplies between horses. If a trainer told me that I needed to have my own grooming kit to take lessons then that would have been even more of an undertaking considering that I already had to invest in breeches, boots, half chaps, and a helmet for weekly lessons. I've NEVER had an issue using brushes between horses, though I keep my brushes clean and would never use them on a horse with signs of some sort of ailment.
Back to the original issue, finding a place to put your phone shouldn't be too big of a problem. I usually either leave mine on the side of the arena, or in my tack locker if I'll be in the pasture. I trust the barns where I've been, so I'd also leave it sitting right on the central counter in the barn. Putting it in a bag sitting next to your trainer is an option if she's not willing to hold it. They even make phone holders that strap around your leg to hold the device, and they don't interfere with your riding.
We have like 20 school horses and none of them have their own individual set of brushes. I have my own set of brushes that I use on every horse I ride. I can ride up to 10 completely different horses a week, sometimes I just put a tune up on a new horse, sometimes I get a horse in just or a month, etc etc and I use that same set of brushes on all of them. They get cleaned periodically but not as often as they should. I've been riding professionally (ie: multiple horses a day, new horses in all the time, etc) for over 10 years and I have never EVER had a case of ringworm or an infectious skin disease in the barn. They all have sleek shiny healthy coats. I'm not saying it can't (or won't) happen but I'm kind of surprised this is such a cause of alarm for certain barns as it doesn't seem (IME) to be that common. Don't get me wrong, we're pretty anal about disinfecting water buckets, especially ones that go to shows, scrubbing stalls, quarantining new horses, etc. but not about brushes and it's never been an issue. In fact... I've never seen it be an issue at any of the bigger show barns i've ridden in for the past 25 years and some of those barns were very very anal!
Back to the OT, just ask your trainer the best place to put your phone! Most of my kids set them on the judge's stand in the area or leave them in the tack room or tack locker. I have had otter boxes and lifeproof cases and drop my phone practically every day off a horse. Haven't had one break yet! (knock on wood)