Now I know what everyone is going to say "Desensitize her" "No need to sedate" etc... At my barn you have to clip your horse for the winter. I don't really know how to sedate since she is the first horse I've owned with this fear. I'm not sure why a person would be required to clip their horse. But it sounds really weird that you would be required to clip her. I've got a couple of comments: 1) If she is that freaked out by the clippers, you are not going to be able to use the milder owner administered drug but should have the vet's sedation. But I know she isn't going to be ready or "fully desensitized" to be clipped without being sedated. I'm clipping everything but her face and legs (i have no clue what the correct term for it is) so it has to last long enough and be strong enough so that she kind of under the whole time. Anyway, it's not something I think you can buy over-the-counter, at least not in my area.So, back to the question, is this wrong and unprofessional. I suggest you not take lessons from such a goofy place that drugs up horses so beginners can ride them on trails.The owner has been working with horses for 35 years, and I trust and value his opinion. This sounds like an accident waiting to happen, stay out of it's way. If the horse is too hot to go out in trails, it should be ridden in an arena and trained professionally, until it is comfortable with the great outdoors.Wait until the horse is fully sedated before switching the clippers on and then start with the neck.It is then beneficial to clip the head on both sides while the horse is at his most sedated, followed by removing any hair from around the quarters and other ticklish areas.2) I had to desensitize one of my guys one time in fairly short order for clipping (he had cushings and desperately needed a summer cut because of heat).I used a kid's battery operated toy (it was a little plastic chain saw with chain that actually moved and was just a tad noisier than electric clippers), started it up and using the advance and retreat method had him accepting it in three days. I second Trail Horse Rider's concern on the seemingly arbitrary clipping requirement.
Sedation often causes horses to sweat so it is important to get any hair removed from the neck, flanks and girth area as soon as possible. I would never have anyone other than a vet sedate my horse. I take lessons at a place that used to breed TBs, their last foal is now 2. Two of the TBs are ex racehorses and have only been off the track for at least a year, but not two.I think my success came quickly with him as I didn't tie him so he knew he could leave it got too much, I started at such a distance from him that he showed no interest at all (going back and forth in a parallel fashion rather than straight at him), moved in towards him just enough to catch his attention then back to repeating the back and forth movement till he settled and repeating those steps until I was right up beside him. I think you should get a good understanding of the necessity for clipping and you'll get that by asking questions of your trainer or barn manager.The first few times I touched him with the toy, I gave a treat right away and after that it was business as usual. When you do find out, I wouldn't mind if you let us know the rationale.I would only clip your horse if it is in full training under saddle in a heated indoor arena in the winter. You will need to blanket the horse to compensate for the inability to keep itself warm without it's fur. Sedation is dangerous and needs to be treated with a healthy respect.I would not sedate the horse yourself unless you know what you are doing. I got every single one if them clipped, even the surliest nut job there was, 98% of the time I was on my own and didn't twitch them. There is an under the tongue formula that can be tricky, but can work as well as IV... Besides, riding a sedated horse can be very dangerous. A sedated horse can be extremely unpredictable so it is vital that this is only done by experienced and efficient people.He didn't seem to have a sluggish response either ride; he seemed fine.I wouldn't have known he was drugged up if I wasn't told. No it's not a good practice and it's certainly not natural in any way, shape or form.