Why has my horse suddenly become bad tempered and girthy?

Why has my horse suddenly become bad tempered and girthy?

Written by: Laura Cackett

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Published on

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Read time 6 min

Any horse showing signs of discomfort should be taken seriously, particularly when their behaviour has changed suddenly or noticeably. These signs can have many possible causes, so we always recommend speaking to your vet to help identify and address the underlying cause.

KEY TAKEAWAYS

A sudden change in temperament, girthiness or ridden behaviour can be a sign that your horse is uncomfortable.

Digestive discomfort is one possible cause, but saddle fit, dental and musculoskeletal issues should also be considered.

If your horse has suddenly become difficult or isn't quite themselves, investigate the cause rather than assuming it's simply bad behaviour.

7 Signs to look out for

Horses can't tell us in words when something feels wrong on the inside. Often, the first clue comes out in how they behave, under saddle, on the ground, or simply in their general mood. Digestive discomfort is one possible cause that's frequently overlooked.

01 | Increased tension or spookiness

Has your normally settled horse become more reactive, tense or easily startled?


This often shows up as a horse who startles at things they'd normally ignore, feels "buzzy" or unable to settle even after work, or holds their breath and tenses through the back when asked to go forward.


It's a low-grade, constant tension rather than a single spooky moment.

02 | Agitation around feeding time

Look for pawing or door-kicking that specifically intensifies in the 10 to 15 minutes before feed arrives, or circling and calling that doesn't settle once feed is in sight.


This is different from a horse who's simply food-motivated and calms down as soon as they see you coming.


The stomach produces acid more or less continuously, whether or not there's food present. After several hours without forage, there may be less food and saliva available to help buffer that acid, which may contribute to discomfort in some horses.


Balancers such as Ulsa-Cool are built around supporting a healthy digestive environment, with natural marine minerals alongside prebiotics (MOS), live yeast and beta-glucans to support the gut microbiome further along the digestive tract.

Supporting Your Horse Through Their Diet


Good nutritional management can help support digestive health, alongside veterinary care.

  • Plenty of forage – keep fibre available and avoid long gaps without it.
  • Appropriate meals – feed according to your horse's individual needs.
  • Quality nutrition – a feed balancer provides essential vitamins, minerals and protein without large feed quantities.
  • Blue Chip Ulsa-Cool – combines marine minerals, prebiotics, live yeast and beta-glucans to support digestive health.

03 | Suddenly becoming girthy

A horse who has suddenly become girthy is worth paying attention to.


Watch for tension when the girth is tightened, pinning their ears, biting, threatening to kick, moving away from the girth or generally seeming uncomfortable when being tacked up.


There can be several reasons for this behaviour. The girth sits over the front part of the abdomen, and if a horse is experiencing gastric discomfort, normal pressure in this area may feel uncomfortable.


Saddle fit, back or muscle soreness and digestive discomfort are all worth considering if girthiness develops or worsens.

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04 | Reluctance to work

Changes under saddle can be another clue.


Watch for resistance to downward transitions, a hollow, tense back rather than a soft, swinging one, reluctance to go forward, or bucking that tends to appear after a harder piece of work rather than at the start.


Ridden work can alter abdominal pressure and movement, which may be uncomfortable for a horse experiencing gastric discomfort. This may explain why some resistance appears around transitions, collection or more effortful work rather than being constant throughout a session.

05 | Stable vices such as weaving, box-walking or crib-biting

Weaving that increases specifically around feed times or when other horses are turned out, or crib-biting that intensifies around feeding, can be a clue that the behaviour is at least partly linked to stress or discomfort rather than boredom alone.


Crib-biting has a particularly interesting physiological link: it increases saliva production, and saliva contains bicarbonate that helps buffer stomach acid. Some researchers have therefore explored whether horses may crib-bite partly as a way of self-soothing gastric discomfort, alongside the more familiar stress-related explanations.

06 | A change in temperament

Sometimes the biggest clue is simply that your horse isn't behaving like themselves.


Teeth grinding (bruxism) when not eating, unusual amounts of yawning, or a horse who seems withdrawn and reluctant to interact even at grooming or feeding time are all worth noting alongside a general change in mood.


Ongoing discomfort can affect a horse's behaviour, making them more reactive, less tolerant and quicker to react to things that wouldn't normally bother them.


A calming, palatable botanical blend, such as the alfalfa, spearmint, eucalyptus, rosemary, garlic and menthol found in Ulsa-Cool, is designed to support a settled, comfortable horse alongside a healthy gut.

07 | Just not themselves

Sometimes there isn't one obvious sign, just a general sense that your horse isn't quite themselves.


They might seem quieter than usual, more irritable, less interested in their surroundings or simply different from the horse you know.


Some owners also notice their horse curling their top lip (a flehmen response) after eating or during work, which can be linked to abdominal discomfort, although it has other causes too.


Trust your instincts. You know your horse's normal behaviour better than anyone, and a subtle change can be worth investigating.

Frequently Asked Questions

Can gut problems make a horse behave badly?

Yes. Digestive discomfort is a recognised contributor to changes in temperament, spookiness, reluctance to work and general irritability, although it is rarely the only possible cause.

Why has my horse suddenly become girthy?

Girthiness can have several causes, but gastric discomfort is one possibility. Saddle fit, back or muscle soreness and other physical issues should also be ruled out if girthiness develops or worsens.

Can ulcers cause bucking, napping or other ridden resistance?

Gastric ulcers can be associated with ridden resistance in some horses. Exercise may alter abdominal pressure and movement, which could make an already uncomfortable horse more resistant.

However, bucking, napping and reluctance to go forward can have many causes. A vet check, ideally including gastroscopy where appropriate, is the best way to investigate whether ulcers are involved.

Is weaving or crib-biting linked to digestive health?

Stereotypies such as weaving and crib-biting are strongly associated with stress, and digestive discomfort can contribute to changes in these behaviours.

Management changes, alongside veterinary input, can help address potential underlying causes.

How do I know if my horse's behaviour is pain-related or just training?

A sudden change, or one that doesn't respond to consistent, fair training, is a good reason to look beyond schooling.

Ruling out saddle fit, dental issues, musculoskeletal pain and digestive discomfort, ideally with your vet, is a sensible first step before assuming it's purely a training issue.

Can a horse have ulcers without showing obvious symptoms?

Yes. Gastric ulcers don't always produce obvious outward signs, so a horse appearing relatively normal doesn't necessarily rule them out. If you have concerns, speak to your vet about the most appropriate way to investigate.

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Written by: Laura Cackett

Managing Director at Blue Chip and has over 25 years’ experience in the equestrian industry. Passionate about horse welfare and nutrition. She enjoys sharing her knowledge and expertise to help horse owners make informed feeding decisions.

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