In Shock - Holes the size of quarters on the side of horse's mouth

Is it possible to cause massive holes about an inch deep and a quarter size on each lip crease simply by having a heavy hand when riding?! I was helping a friend at a local barn and saw a big mare with raw, bloody, open wounds and very obvious swelling on both sides of her mouth. I’ve heard of small wounds there, but have never seen anything like this. I checked the horse’s card and it is owned by the on-site trainer. She is a well known and seasoned hunter/jumper trainer in the area. My blood boiled when I saw it, but I don’t want to jump to conclusions and I find it hard to believe a well known trainer would put a horse through that, let alone have it’s stall near the front of the property where boarders would see it.

Has anyone else seen large open wounds caused from riding or could it be something else? I’m assuming they ride in snaffles which could pull on the lips. I’d be beside myself if I boarded there and that was caused by the trainer!

Could it possibly be summer sores? Would it make sense that the horse has one on either side of it’s mouth and it has nothing to do with the bit? I don’t have any experience with summer sores, but it’s been really hot and humid lately. I just can’t imagine a person causing that kind of damage to a horse’s mouth.

The only time I’ve seen lip sores of that scale was on a horse who turned out to have an allergy to some type of metal (nickel I believe) and had been ridden in a bit that contained that metal.

Doesn’t sound like the trainer is trying to hide anything – maybe they just got unlucky with a similar contact allergy?

Oh that’s interesting - I’ve never heard of such a thing. It definitely didn’t seem like she was hiding anything and I’ve heard nothing but great things about this trainer. That’s why I was so shocked. The sores were similar to a horse I saw with cancer on his lips but it wouldn’t make sense on both sides. The allergy would definitely make sense.

What kind of bit was it in? I’ve seen D-ring bits rub the heck out of some horses faces. But you would have to really let it go for it to get that bad.

I’m not sure. I only saw it in its stall.

A Dee ring did something similar to my horse in 2 rides. It was not from the edge of the D. I think the ring was just too big and it caused some rubbing on the cheek about halfway between the noseband and the corners of the mouth. It was also really, really hot and horse got sweaty. Of course they were not deep (an inch deep is quite a hole!!), but rubbed quite raw about that size in diameter. On the second ride I had tried moving the noseband to lessen any wrinkling of the skin on the cheek but it just got worse. So, I stopped using that bit. I had used it a couple rides several months prior without issue, when it was much cooler weather (horse was clipped so it wasn’t just an issue of hair).

My gelding had summer sores in the corners of both sides of his mouth that started out very deep and about quarter sized. One side was larger than the other, and he also had some smaller summer sores along his lip. The corners were also very swollen which my vet said is normal for this location.

I was thinking this could be a possibility as I was reading the beginning of your post, then you also mentioned it. I would think an issue with the bit would be more likely than symmetrical summer sores, but it is possible :frowning:

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Is there any reason you could not ASK the trainer/owner what happened?
Seems like there was no attempt to hide the injury, so why not be direct?

FWIW: my DH’s very fleshy-lipped TWH got bloody sores from the loosering snaffle we tried on him first.
Rings pinched the corners of his mouth as they moved - flesh catching on the rings.
Switching to an eggbutt fixed that.

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I was at the barn briefly and didn’t see her around. Plus my initial thought was heavy hands and I was a bit heated - it took me getting half way home before I started to get my brain back and think of other scenarios.

That’s what I’m thinking. They were SO deep and swollen that I can’t imagine a bit causing it and there was some asymmetry between sides. It was also 113 degrees here on Friday through the weekend (unheard of heat in Southern California) so that could have made it worse.

Well sounds like you (admittedly) jumped to a conclusion w/o facts other than visible sores.
Next time you visit that barn you can ask.

Horses manage to injure themselves in amazing ways & not always with the assist of humans.
Says the owner of TB who cut his lip - needing 7 stitches to close - on a Sunday, in his stall, w/o a visible speck of blood anywhere & no sharp object located as a cause.
Friend’s horse pulled a board down in his stall, then laid directly on the upward-facing nail. Missed his intestines by about .5".

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I’d ask the trainer too. “Hey, I noticed your horses mouth. Do you think those are summer sores or maybe the bit”?

My mare had similar summer sores on her mouth. They weren’t symmetrical. Either way they need to be treated.

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are you sure it is not ulcers, from foxtail, medication, or some other plant?

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Certain insects, think bots, other nasty species of fly, etc, can cause mouth wounds. I’ve seen horses with mouth ulcers caused by bots. It’s disgusting. Pair that with a thin-skinned or otherwise sensitive horse and it’s a perfect storm.

I’ve also run across a gelding who was constantly itching himself and in doing so managing to hook his mouth on a corroded piece of metal on a pipe corral-style gate. It took WEEKS for the resulting wound to heal as everything irritated it, from the bit to anything short of soft grass hay.

Summer sores most likely

Foxtail in the hay