Why now is the right time to evaluate your horse’s condition, topline, and muscle health

At the midway point of the year, it’s tempting to push forward, focusing on training plans, competition calendars, and surviving winter’s demands. But July offers a unique opportunity: a quiet reset. This is the perfect time to reflect not just on your goals, but on your horse’s physical state — and make adjustments before small issues become big ones.

A proper mid-year condition check for your horse is more than just a glance over the stable door. It’s a thorough process of evaluating weight distribution, muscle development, topline integrity, and overall function — ideally with the input of your vet, physiotherapist, or equine nutritionist.

Fat ≠ fit: why weight isn’t the whole story

While weight is commonly used as a proxy for condition, it doesn’t tell the whole story. A 2020 review published in the Equine Veterinary Journal emphasised that body fat coverage and muscle mass must be assessed separately to understand overall health. A horse can be overweight but under-muscled, or appear lean while maintaining excellent muscle tone and fitness.

The widely used Henneke Body Condition Scoring (BCS) system, which rates fat deposits on a 1–9 scale, remains a valuable tool, especially when used in conjunction with topline scoring systems like those promoted by Progressive Nutrition. These assessments examine muscle development in the neck, withers, back, and hindquarters, providing a more nuanced picture of athletic readiness.

“Horses may maintain or gain fat over winter, particularly if confined or fed high-energy diets, but simultaneously lose topline and core strength due to reduced exercise or uneven movement,” notes Kentucky Equine Research in their topline evaluation guidelines.

Still, it is worthwhile to assess your horse’s body condition score at this midway point of the year. If you have previous numbers to refer back to, use these to assess how your horse is coping with the colder weather. If you don’t, still record your figures now and keep track of them over the coming months to see how seasonality, as well as any dietary changes, affect your horse’s body condition score. Of course, the absolute number scored can give you a good idea about whether you need to adjust the diet in any way, but observing a trend is also helpful for tracking changes over time.

Topline assessment

Alongside your body condition score check, a topline assessment is a good way to evaluate your horse’s muscling and tone. Topline scoring evaluates the muscular development along the neck, withers, back and hindquarters — the areas that show if your horse is working in a balanced, biomechanically healthy way.

About the topline assessment

Two things cover the topline: fat and/or muscle. Most horses must reach a BCS score of 7 before their bodies lay fat along the topline. In contrast, in horses with BCS scores of less than 7, muscle development of the withers, back, loins, croup, and hindquarters makes up the visible topline.

The topline grading system developed by Progressive Nutrition is as follows:

• Grade A—The ideal topline; according to the grading system, “The back, loin and croup are full and well-rounded. The topline muscles are well developed and blend smoothly into his ribs. The horse should be able to perform work requiring the use of all of these muscles.”
• Grade B—The topline is sunken in the back area between the vertebrae, and concave at the top of the ribs.
• Grade C—The topline is sunken in both the back and loin areas.
• Grade D—The topline is sunken in the back, loins, and croup.

How the scoring system works:

• Areas assessed: The topline evaluation focuses on three key areas: the withers and back, the loin, and the croup.
• Assessment: The horse’s topline is assessed visually and by palpation (feeling) to determine the level of muscling in each area.
• Scoring: Each area is assigned a score based on the level of muscling, with the overall grade determined by combining the scores from each area.
• Nutritional significance: The system is used to gauge the adequacy of a horse’s diet in providing the necessary amino acids for muscle development.

The importance of the topline assessment

Muscle development along a horse’s topline is a useful evaluation tool to determine condition and strength. With periodic assessment of muscle mass along the topline as well as attention to nutrient balance in your horse’s diet in conjunction with exercise, you can maximise your horse’s muscle development. Make sure your horse is consuming enough essential amino acid building blocks for muscle so that he can develop a healthy topline and perform to his genetic potential.

Harder surfaces, stiffer joints and fewer hours of exercise in winter can all contribute to a loss of muscle over the season, especially in older horses or those returning from injury. Even a slight dip behind the withers or loss of definition in the hindquarters may suggest your horse needs support — whether that’s nutritional, training-related, or physiological – so paying close attention is undoubtedly worthwhile.

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Top tip

Use your hands as well as your eyes. Palpation can help detect atrophy, asymmetry, heat, or sensitivity in the topline musculature. Photographing your horse at consistent angles every 4–6 weeks can also help track subtle changes over time.

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Feeding for weight and muscle maintenance

Research from the University of Minnesota’s Equine Extension programme indicates that horses may require 15–25% more calories during cold weather to maintain body condition, particularly when temperatures fall below the horse’s lower critical temperature (LCT), estimated at around 5°C for most unclipped horses.

It is therefore important to look closely at:

• Ration balance (not just energy, but protein quality —especially essential amino acids— and micronutrients)
• Fibre first – ensure your horse has access to adequate quality forage, provided ad lib.
• Supplemental oils or fat-based feeds (such as flaxseed or stabilised oils) where extra energy is needed without sugar spikes
• Evaluate vitamin and mineral balance

Muscle-specific nutrition

If energy demands in winter aren’t met through diet, horses may begin to catabolise muscle tissue to meet their metabolic needs. Atrophy (wasting) of topline muscles begins in the withers, then continues to the back and gradually extends through the loins and croup and down into the hip and stifle. Rebuilding muscle occurs in the reverse order.

Exercise activates muscle conditioning processes while nutrition provides its building blocks in the form of amino acids. After all water is removed, muscle is comprised of 73% protein and 22% fat.

To build the strong muscle needed to improve topline, a horse needs all 10 essential amino acids (which the horse’s own body can’t produce; he must acquire them through his feed) in his diet:

• Lysine, for young horse growth (this is the first ‘limiting’ amino acid);
• Threonine, for older horse repair and maturation;
• Methionine, for hoof and hair growth;
• Valine, leucine, and isoleucine, which are branch-chain amino acids important for muscle recovery;
• Phenylalanine, a building block for proteins as well as being a precursor to neurotransmitters;
• Tryptophan, a building block for proteins as well as being a precursor to neurotransmitters; and
• Arginine and histidine, which are used in protein biosynthesis.

The rate of muscle protein synthesis is fastest during growth, and synthesis rates decline as the animal ages. If there is an inadequate amount of any of these essential amino acids in a horse’s diet, protein synthesis will only occur to the level of the limiting amino acid. For example, if a diet contains 125% (of what the horse needs in) lysine, 110% methionine, 101% threonine, and 80% tryptophan, then the horse will synthesise all the amino acids into protein at 80% of his potential.

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Top tip

The percentage of protein on a feed tag does not give the complete picture because it doesn’t break down the individual amino acid content on the label. It is also important to look at practical consumption rates as well as exercise level – intense training doubles a horse’s protein needs from ‘maintenance’ requirements.

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A mid-year diet review with a qualified equine nutritionist can help ensure the feed is supporting—not undermining—muscle maintenance and performance.

Movement analysis

In addition to hands-on palpation and topline assessment, observing your horse in motion is a vital part of any condition check. Watch your horse walk and trot in a straight line and on the lunge, ideally on both hard and soft surfaces. Look for rhythm, regularity, and symmetry between left and right — subtle discrepancies in stride length, tracking, or foot placement may be early signs of discomfort or emerging lameness. Filming from the front, side, and behind can help you spot issues that are easy to miss in real-time. Research from the Royal Veterinary College suggests that many horses with low-grade, subclinical lameness present only under specific conditions, so don’t rely on a cursory glance. Enlist the assistance of a knowledgeable trainer, veterinarian, or physiotherapist if anything appears uneven.

This visual check is not just about soundness — it also helps identify whether the horse is carrying themselves evenly, engaging their core, and pushing from behind, which are all key indicators of healthy muscular development and strength.

Resetting work: a balanced rebuild

Once your condition check has been performed and any issues are identified, the aim is not necessarily to return immediately to intense schooling, but to rebalance the horse from the ground up to address any small issues before they escalate.

Veterinary rehabilitation protocols increasingly prioritise deep stabiliser activation before heavier work. The multifidus muscle, responsible for spinal stability, has been shown to atrophy quickly in horses on box rest or inconsistent work, and takes time to rebuild (Stubbs et al., 2011). For this reason, core-focused groundwork, light hill work, pole exercises, and long-lining are ideal ways to restore strength and proprioception, improve muscling and ensure your horse is best prepared for the demands of the next six months.

Adding in physiotherapy, chiropractic review, or myofascial release therapy at this point can help identify imbalances before they manifest in training resistance or injury.

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NOTE: While exercise will condition muscle, it does not make muscle. Rather, muscle production and repair require the essential amino acids as well as the nutrients the horse uses while working.

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A mid-year moment of honesty

The best riders are not those who power through regardless, but those who pause to listen to what the horse’s body is saying. A mid-year condition check allows for honest reflection:

• Is your horse muscling symmetrically?
• Are you supporting their changing needs nutritionally?
• Have you noticed any changes in behaviour, posture, or performance?

Use this time to reconnect with your horse’s body. Take photos. Track changes. Bring your vet or physio into the conversation — not just when there’s lameness, but when there’s doubt.

This isn’t about perfection. It’s about awareness. The mid-year condition check is a valuable tool for every rider, whether amateur or professional, to deepen their partnership with their horse and set a more considered course for the second half of the year.

Mid-year condition checklist

• Body Condition Score (BCS) using the Henneke scale
• Topline evaluation (photos, palpation, and observation)
• Saddle fit reassessment
• Winter feeding analysis (especially protein, energy, and micronutrients)
• Movement screening: walk, trot, canter (ideally videoed)
• Plan for progressive training or rehabilitation if necessary

References:

• Kentucky Equine Research. Topline Evaluation System. www.ker.com
• Clayton HM & Stubbs NC. (2005). The relationship between static posture and dynamic motion of the equine back. Equine and Comparative Exercise Physiology.
• Stubbs NC et al. (2011). Functional anatomy of the equine back and its relationship to injury and performance. Equine Veterinary Journal.
• University of Minnesota Extension. Winter Horse Care Series.