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How to Stop Your Horse From Opening His Mouth (Without Using a Flash)

How to Stop Your Horse From Opening His Mouth Without Using a Flash Dressage

Contact” is the third element of the dressage Scales of Training. In an ideal scenario, the dressage judge wants to see that your horse is working confidently forward through his back to seek an elastic, consistent contact without showing any signs of resistance.

Unfortunately, many dressage horses tend to work with their mouths open.

So, in this article, we take a look at why a horse opens his mouth, and we discuss how to stop your horse from opening his mouth without using a flash.

What causes contact issues?

A horse that habitually works with his mouth open generally does so in an attempt to escape from pain or discomfort in his mouth.

Such discomfort can be caused by:

  • Dental problems
  • The rider’s unsteady hands (constantly pulling or seesawing at the horse’s mouth)
  • A poorly fitting bit
  • Tension
  • A combination of the above

Tack can also cause a horse to open his mouth when ridden.

For example, sometimes, if a horse is ridden in draw reins, he will come behind the bit when the draw reins come off, opening his mouth against the expected effect of the gadget on the bit.

The effects of contact issues

Often, the horse that works with his mouth open displays other evasions and problems in his way of going.

Some horses tend to work above the bit, raising their heads high away from the contact. That causes the horse’s back to become hollow and tight and their hindquarters to tense up. Consequently, the horse is unable to use his hind legs correctly, and his hocks will trail out behind him, rather than stepping underneath his body.

Other horses avoid taking the contact forward by curling up behind the bit, pulling their noses into their chests in an attempt to evade the bit and the rider’s hands or both.

In both these scenarios, the horse is not supple through his neck and back, is therefore unable to work with true impulsion. He will also most likely be unbalanced, as he cannot bring his hocks underneath his body, and the rider will be unable to use an effective half-halt.

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Correcting the open mouth problem

Unfortunately, working with the mouth open can quickly become a habit for some horses. Once that habit becomes ingrained, it can be difficult to cure.

However, whatever the reason for your horse working with his mouth open, DO NOT resort to forcing the horse’s mouth shut by using a tight flash or crank noseband, as that will only lead to more misery for the horse and create even greater resistance and evasion.

Before you can work on solving the problem, you need to understand why your horse opens his mouth.

The headcollar test

Start by lunging your horse in just a headcollar or cavesson. Don’t use a bit or side reins. The idea of the exercise is to observe how the horse works without the influence of any form of tack.

If the horse happily trots around on the lunge on both reins with his mouth closed and stretching forward and round over his back, you can see straight away that the open mouth problem is caused in some way by the presence of a bit and bridle.

Now, repeat the exercise, but this time, lunge the horse in a plain cavesson bridle and his usual bit. Watch the horse closely to see how he reacts to having the bit in his mouth.

If the horse’s mouth remains closed and he’s happy to trot forward, fit a pair of loose side reins, and lunge the horse, encouraging him to work forward through his back toward the bit. Is the horse’s mouth closed, or does he immediately open it and raise his head away from the loose contact?

This exercise will give you a good indication of where the problem lies. Generally, a horse that is quiet in his mouth in all these scenarios has a problem with the rider’s contact and how it affects the action of the bit in his mouth.

Dental check

First of all, you should ask a qualified equine dentist to check your horse’s teeth to make sure that there are no sharp edges or hooks that could be causing the horse discomfort when you pick up the contact with the bit.

Once any issues have been treated, regular dental examinations should help to highlight potential problems, enabling you to take preventative action in the future.

Poorly fitting bit

If the horse’s bit doesn’t fit him properly, he may open his mouth to escape the discomfort it is causing.

For the horse to be comfortable in his mouth, he must be able to move his jaw freely, from side-to-side. When the horse has a bit in his mouth, he salivates, and so he needs to be able to swallow. When the horse swallows, his tongue is lifted toward his palate.

If the bit is painful, too thick, is held too strongly by the rider’s hand, or if the horse has his jaw clamped shut by a noseband, he will be unable to lift his tongue and swallow, and his jaw will remain tense. The horse will then push back against the bit with his tongue in an attempt to lift it so that he can swallow. That leads to tension not only in the horse’s tongue but in his neck and jaw too.

The bit should not protrude from either side of the horse’s mouth, and it should not be too thick or thin. If the bit is too small, it will pinch the horse’s lips. If the bit sits too high or too low in the horse’s mouth, it can crash against his teeth, causing him discomfort.

As well as fitting the bit correctly, you must choose one that suits your horse as every horse’s mouth is unique in size and shape.

To find the best bit for your horse, ask an experienced bit-fitting service for advice, and be prepared to experiment. Your horse will soon tell you what bit he prefers and how it should be fitted for his comfort.

Rather than buying umpteen bits until you find the right one for your horse, use one of the many “bit bank” services that you’ll find online and borrow a few different bits.

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Unsteady hands

If your unsteady hands are causing the problem, you’ll need to work on developing a more independent seat. That will enable you to ride in a secure balance and with quiet hands.

Never use the reins for balance; your hands should always work independently of your seat.

To give you a clear understanding of just what your horse feels when you take up the contact, play the “bit game.”

Take the bit and reins off the bridle. Hold the bit in your hands and ask a friend to hold the reins. Your friend then applies pulls, seesawing, and bumps to the bit, simulating the motions that you typically use, then you’re asking your horse to turn and halt. That will give you a clearer appreciation of exactly why your horse has a problem with your hands!

So, how do you know if your hands are unsteady? Try dropping your little finger onto your horse’s neck and see if you can keep it there while the horse is trotting and cantering. If you can’t keep your pinkie in touch with the horse’s neck, your hands are bouncing.

Once you’ve improved your seat and your unsteady hands are no longer the issue, you can start to work on undoing your horse’s evasive habit.

Try lunging your horse in side reins with elasticated inserts or “donut” rings. The consistent, elastic contact provided by the side reins helps to teach your horse that reaching for the bit isn’t uncomfortable anymore. Working on a circle also encourages relaxation and helps to create a good rhythm.

Another helpful exercise that you can try is to work your horse over low cavaletti or poles on the ground. That encourages the horse to stretch forward and down. Once the horse understands that he can trust your hands to be quiet and soft, he will begin to reach for the bit.

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Also, tension can cause a horse to develop the habit of working with his mouth open, even though there is no physical discomfort involved.

A horse that is tense may sometimes express his anxiety by showing resistance to the contact and opening his mouth.

In this scenario, your goal is to encourage relaxation.

How you can solve the problem of tension depends on what the root cause is. It may be that desensitization will help to solve the problem, or perhaps working the horse in the company of an experienced older animal may be effective.

In conclusion

The way to stop a horse from opening his mouth is not by clamping it shut with a flash, drop, or crank noseband!

Opening the mouth when ridden is generally a symptom of an underlying problem, such as dental issues, poor riding, or a badly fitting or unsuitable bit that is causing the horse pain or discomfort.

Once you’ve diagnosed the problem, you can set about solving it, which will ultimately result in a happier horse and a softer, more elastic contact.

If your horse tends to work with his mouth wide open, tell us your story in the comment box below.

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  1. Hi my friends horse has a large tongue and constantly plays with it when being worked even when there is no contact . Im sure he pushes the bit out to avoid the join and so he can avaid work
    Tried many bits and he had his teeth done ! My friend is a novice and can be bit heavy handed and heavy in the seat !
    Any advice you can suggest?

    1. Hi Claire,

      Thanks for reading our post and commenting.

      Unfortunately, this is almost a near-impossible problem for us to help with over the internet since there are many different reasons why this could be happening. Anxiety, tension, incorrect training, saddle fitting/back issues, etc are just some of the other reasons why this behaviour could be occurring.

      Our advice would be to look for a very experienced dressage trainer who could help work through solving the problem with you.

      I am sorry that we couldn’t help you out more, but there are simply too many possibilities for why he may do this.
      HTD x

  2. Hi, my horse opens his mouth often when i’m riding, i used the technique that was suggested in the artical with my pinky fingers and they stayed still. I am constantly adviced to get a grackle bridal for him. He had his teeth and back checked 4 months ago and was all okay. Any advice on the next steps?

    1. Hello Sophie,
      Assuming that there are no physical problems and that you have nice still hands providing the horse with an elastic contact to work into, then the next steps that we would advise is teaching the horse HOW to connect to the bit correctly. This comes from teaching the horse how to use his whole body correctly. If you search our website for articles about ‘contact’ (also try searching for the keyword ‘bit’) we have lots of information to help you do this, but here are three articles to help get you going.
      – How to ride your horse on the bit –
      – How to teach your horse to accept the bit –
      – How much contact should you have? –
      I hope that helps
      HTD x

  3. Hello,
    When I tried my horse (sept 21) he was heavy on the bit abs occasionally had tongue flailing out, it is now obvious his tongue was popping in , out and over the bit.
    I purchase him and we set to to try and help his mouth issues. Teeth to the normal equine technician looked fine. Had mouth xrayed and showed two small indents on both first lower molars but not that would cuss any interference. This we were told would not affect him really.
    The cause of his open mouth is mainly anxiety, does firstly when put a bit in before have done up all bridle etc so we automatically presumed bit is discomfort , but, he also Will do it on the x ties on his own with no bit in. Mouth open, jaw crossing, foot tapping blatantly showing discomfort but there is nothing there for discomfort, it’ really is a anticipation anxiety things.
    Many hits tried with a bit specialist and now found a suitable match, however in any noseband or not mouth is still opening, more when tense and now affecting our marks for dressage tests. Any help greatly appreciated

    1. Hello Debbie,
      Thank you for visiting our website.

      This is a very tricky issue to correct, simply because there could be so many causes. It sounds like you are doing all the right things by ruling out various causes of physical discomfort. In addition to what you have already done, it may be worth considering having him looked at by a physiotherapist or a qualified equine bodyworker to rule out possible pain in his back, neck, and poll.

      If it does come down to pure anxiety, then your goal is to try to reduce his anxiety as much as possible, which is not always an easy thing to do. Also, depending on his age and how long he has been popping his tongue out, it may have developed into a habit, which is even harder to correct. In both scenarios, it’s simply patience and time.

      Another option to consider (depending on your circumstances) is to turn him away for at least a season. Let him live out and rough off. Then bring him back into work and start from scratch as you would a newly backed youngster. Take your time to ensure that he stays totally relaxed and develop the contact again. It’s not guaranteed to fix the issue, but it’s an option that you could try.

      I hope that helps.
      HTD x

  4. Hello,

    Right now I am training a 5 year old pony, that was just saddle trained about 1 year ago that has an issue with her opening her mouth and shaking her head when I’m asking her to hault.
    My trainer thinks it’s her attitude, cause she does like stating her opinion, so she keeps telling me to put a flash on. I don’t really want to at all cause I have done my own research about it and I don’t like the consequences of it. I tried to explain but she still wants me too. And she brings up how experienced she is in training young horses and stuff like that and explaining how this is just a phase, but mostly all her horses still have flashes on since they have started being ridden on. I was wondering if I could get a second opinion?

    1. Hello,
      Thank you very much for visiting our website.
      There are many possible reasons as to why your horse is opening her mouth and shaking her head as you ask her to halt, and without knowing the horse or seeing the transition being ridden, it’s very difficult to advise. However, assuming there are no physical issues (bit and bridle fit correctly, teeth and mouth have been inspected, etc.), then here are some key points that may help you when riding and training the halt.

      1. Although the halt transition is about stopping, you need to allow the horse time to step into the halt. Especially, since your horse is very young and at the beginning of her training, allow the transition into halt to be progressive. It’s okay if she takes a few smaller walk steps into the halt, this way she is learning to move FORWARD into the halt. As she develops in her training, you can then start to make the transitions more direct.

      2. Horses will come against the contact (and subsequently open their mouth) when they lose their balance onto the forehand. Again, your horse is very young so she will lose balance frequently. So, focus on riding a smooth transition into halt whilst giving her time to move her hind legs underneath her to help her balance. If she falls onto the forehand during the transition, then her weight topples into the bit.

      3. When riding the halt transition, don’t just apply pressure to the reins until she stops. Instead, whilst in walk, stop following the horse’s movement with your seat and give a small half-halt down the outside rein. If she doesn’t stop, give another small half-halt, whilst all the time holding your hips and seat still. Keep repeating until she halts, then allow her to stand quietly on a fairly relaxed rein but still maintain a light contact. Give her a pat and walk forwards again, allowing your hips to relax and follow her movement once again. Then repeat the exercise. After a few attempts, she should start to halt as soon as she feels your seat stop. The focus here is to ride the transition more from your seat than from your reins. Without any backwards pressure on the bit, she should have nothing to object to.

      Hope that helps.
      HTD x

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