Your mare is opening her mouth because she is trying to tell you something in the only way she knows how. Most likely she doesn’t like the bit you are using and you do not specify what kind of bit you are using. Saying a D-Ring snaffle tells me only one thing about the bit and that is what the rein action is. The most important part of a snaffle is the mouth piece. What is actually in the horses mouth, Straight bar, Single Jointed, Double Jointed, Multi Jointed, Ported etc. A snaffle bit works on Direct rein contact however the mouth piece determines how that contact is applied. A single jointed works directly on the bars of the horses mouth however some horses don’t like the nut cracker action it gives and often the joint can end up hitting the horses palate making it uncomfortable and sometimes painful. A double jointed bit works on the bars of the horses mouth as well as working on the tongue. The double joint creates more of a U shape compared to a single joints V shape making it a more comfortable fit in the horses mouth and more horses prefer it to a single joint. Also the type of joint differs in how the pressure on the tongue is relaid.Multi jointed bits should only be used by people that understand them. They are generally good for horses who lean on the bit a lot and helps prevent it. They do have a harsher action than single and double jointed.Ported bits are designed to make room for the horses tongue. However when fitted incorrectly the result is the bit squashing the horses tongue. Also large ports often hit the horse in the palate when the rein is picked up and this can result in pain and discomfort for the horse. Ports are not often found on simple snaffles and more likely found on Leverage bits. Adding a noseband will only make the problem worse. Your horse is trying to tell you something, you have acknowledged that there is a problem and instead of trying to rectify the problem you just want to make it go away like 90% of horse owners who would rather hide problems than fix them. By adding a noseband, all you are doing is attempting to hide the problem and make riding more uncomfortable for your horse.Horses act out for a reason. 9 times out of 10 that reason is too tell us that something is wrong, whether it be pain, discomfort, fear, confusion, unbalanced etc, it is up to the rider to determine what the reason is before claiming the horse is just naughty. Yes horses can be naughty but often that is not the reason they act out. You horse is not being naughty, she is telling you that something is wrong and you are wanting to ignore it.Change your bit before you attempt anything else. And when I say change the bit I mean actually changing the mouth piece. Western bits appear to be very limited so you may want to read this: http://www.sustainabledressage.net/tack/bridle.php… Do not ignore it because it says Dressage and that is English riding. It doesn’t matter what discipline it is. All bits across the disciplines fall into the same categories, Direct Rein or Leverage Rein and by reading up on different bit actions you can find something more suitable for your mare....
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