Autumn brings warm, sunny days, cooler nights and rainfall. These changing conditions can trigger a new flush of grass growth, changing the nutritional composition of pasture and potentially affecting horses that are sensitive to these changes.
Some horses cope well with seasonal pasture changes, while others develop noticeable changes in their behaviour, movement, digestion or skin.
Understanding the connection between pasture and your horse's wellbeing can help you recognise potential triggers and make more informed decisions about their diet and management.
Signs to Watch for in Autumn
1. Swelling and Oedema
Swelling around the cheeks, shoulders, lower legs or abdomen can have several causes. In some horses, dietary factors and mineral imbalances may contribute to fluid retention.
Pay attention to when the swelling appears, whether it changes throughout the day and whether it coincides with changes in pasture or feed.
Persistent, sudden or widespread swelling needs further investigation rather than assuming it's simply a grass-related issue.
2. Digestive Discomfort and Gas
Rapid pasture growth can change the amount and composition of the forage a horse consumes. Some horses develop digestive discomfort when their grazing changes, including bloating and increased gut sounds.
Keep an eye on your horse's manure, appetite, comfort and general behaviour when the grass begins growing more actively.
Signs of colic should never be dismissed as ordinary gas. Significant abdominal pain, repeated lying down or rolling, sweating or a horse that appears unusually distressed needs urgent attention.
3. Weakness or Difficulty Standing
A horse that suddenly lies down, struggles to stand or appears weak may have a serious underlying problem. Mineral disturbances can affect normal muscle and nerve function, but they aren't the only possible cause.
Don't assume this is simply an autumn grass issue or attempt to correct it with calcium without understanding what's happening. Sudden weakness or an inability to stand requires urgent assessment.
4. Staggers and Loss of Coordination
Subtle changes in coordination can be easy to miss. You might notice your horse stumbling, knuckling over, struggling to walk backwards or finding downhill movement difficult.
More severe signs can include weakness in the hindquarters, an unsteady gait or falling over.
Pasture-related toxins and nutritional factors may contribute to some neurological or muscular problems, depending on the circumstances. However, these signs can also have other causes, so don't automatically attribute them to grass.
Review the pasture for potentially problematic grasses, seed heads and other plants, particularly following seasonal changes or drought-breaking rain.
5. Mud Fever and Greasy Heel
Autumn rainfall and persistently damp conditions can contribute to skin problems around the lower legs, including mud fever and greasy heel.
Look for scabs, redness, irritation, crusting or sore areas, particularly around the heels and pasterns.
Keep affected areas clean and manage prolonged exposure to wet, muddy conditions. Greenpet's Colloidal Silver Gel is one topical product to consider as part of a suitable skin-care routine.
6. Metabolic Changes and Laminitis
Autumn grass growth deserves particular attention in horses prone to metabolic problems or laminitis.
Watch for changes such as:
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A firm or enlarged crest
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Unusual fat deposits around the tail head and behind the shoulders
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Changes in body condition
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Warm feet or increased hoof sensitivity
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Reluctance to move, shortened strides or difficulty turning
These signs can indicate that your horse's metabolic health or hoof comfort needs attention. Fat deposits alone don't confirm Equine Metabolic Syndrome, and hoof soreness can have several causes.
Laminitis can develop quickly and cause significant pain. Early action is important, so don't wait for obvious hoof changes before reviewing your horse's grazing and overall diet.
For more information, read our guide to Laminitis: Causes and Natural Management.
7. Headshaking, Head-Flicking and Skin Twitching
Some horses become noticeably more sensitive during seasonal pasture changes. You might see repeated head flicking, twitching of the skin, unusual sensitivity to touch or attempts to rub the nose against a leg.
Diet and pasture are worth considering, particularly if these signs repeatedly appear alongside changes in grass growth.
However, headshaking can have several triggers, including environmental irritation and nerve-related sensitivity. It's important to consider the full picture rather than assuming mineral imbalance is the sole cause.
Read more in our guide to Headshaking in Horses.
8. Muscle Tension and Changes in Movement
Muscle tightness, reduced flexibility, difficulty with canter transitions and changes in hindquarter movement may appear to be purely physical problems.
Dietary imbalances can affect normal muscle and nerve function, so pasture and mineral intake are worth reviewing when these changes coincide with seasonal grass growth.
However, movement problems can also arise from pain, injury, hoof issues or other underlying conditions. Look at your horse's diet alongside their workload, movement and overall comfort.
9. Severe Itching and Skin Irritation
Persistent itching can be distressing for both horses and their owners, particularly when a horse rubs its mane, tail or body until the skin becomes raw.
There are many potential triggers, including insects, environmental irritants, skin conditions and individual sensitivities. Dietary factors may also be worth considering as part of a broader approach.
Alongside suitable topical care, review your horse's pasture, feed and general management to identify possible contributing factors.
For more information, see our guide to Natural Alternatives for Itchy Horses.
What Can You Do if Your Horse Is Grass-Affected?
If your horse's symptoms appear or worsen when autumn grass begins growing, look beyond the symptoms themselves and consider the whole diet and environment.
Start with these practical steps:
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Review the pasture. Consider the grass species, stage of growth, clover content and recent weather conditions, particularly after rainfall following a dry spell.
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Assess the whole diet. Look at pasture, hay, hard feeds, supplements and the overall balance of nutrients rather than focusing on one ingredient.
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Provide suitable forage. Ensure your horse has adequate fibre and that their grazing arrangements suit their individual needs.
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Keep a symptom diary. Record changes in behaviour, movement, skin, manure and hoof comfort alongside changes in weather and pasture growth.
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Seek advice when needed. A horse that is suddenly weak, uncoordinated, in significant pain or showing signs of colic needs urgent assessment rather than a trial of supplements.
For more detailed guidance, read our article on Feeding Grass-Affected Horses.
Need Help With Your Horse?
At Greenpet, we look at the relationship between diet, pasture, nutrition and overall wellbeing. Every horse is different, and the right approach depends on the individual animal and the conditions they're living in.
If you're concerned that autumn grass may be affecting your horse, ask our naturopath for guidance on reviewing their diet and natural care options.