05/07/2026
When people hear the word performance, they often think about soundness, fitness, and whether a horse is ready to compete. But performance medicine is much broader than that. It is about taking a systematic approach to any horse or pony whose health, function, or athletic ability has changed. And yes, that includes elderly or retired ponies who are no longer ridden or competing.
Their “performance” may simply be their ability to maintain body condition, move comfortably, and enjoy a full day turned out in the paddock. When something changes - such as progressive weight loss - it deserves the same methodical approach that we would apply to an elite competition horse. So if you’re wondering what type of cases we offer consultations for, the variety may surprise you! Performance medicine is certainly not defined by whether a horse competes!
In this case for example, a faecal worm egg count had already identified a significant worm burden, providing one potential explanation for the weight loss. Chronic parasitism can result in reduced nutrient absorption, protein loss, chronic intestinal inflammation and altered gastrointestinal function. Together, these effects can leave horses in a negative energy balance, impair immune function, and reduce their ability to regain body condition, even after an appropriate anthelmintic programme has been implemented.
However, a heavy worm burden should not automatically be assumed to be the sole diagnosis. An ageing horse with an underlying systemic disease may have reduced immune competence, making it less able to regulate parasite burdens than a healthy individual. In these cases, the worm egg count becomes part of the clinical picture rather than the entire diagnosis.
This is why every finding needs to be interpreted within the context of the whole patient. A high faecal worm egg count should usually prompt treatment, but it should also prompt further clinical reasoning:
• Is the degree of weight loss proportional to the parasite burden?
• Are there abnormalities on clinical examination that suggest concurrent disease?
• Is there evidence of chronic inflammation, anaemia, protein loss or organ dysfunction?
• Could dental disease, endocrine disease, hepatic or renal pathology, gastrointestinal disease or neoplasia also be contributing?
With this horse, the examination extended beyond the worm count. Blood samples were also collected for haematology and biochemistry to investigate for evidence of systemic inflammation, organ dysfunction, metabolic disease, or other conditions that may have contributed to the weight loss. After all, finding one abnormality should never stop us asking whether there is another disease process occurring at the same time, particularly in geriatric horses.