EquiiMed brings specialist veterinary services directly to equine practitioners and their clients.


EQUIIMED provides a range of specialist services including, but not limited to, ultrasound, endoscopy, ophthalmic exams, cardiology, fitness assessments and interpretation of laboratory data.

Poor performance
Fitness assessments
Weight loss evaluations
Respiratory System
Neurologic system

Heart Size
Athletic Performance
Gastrointestinal Tract
Muscle Diseases

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Dr Guy Lester

Board-certified specialist in equine medicine

Dr Lester has an extensive history in referral equine medicine, including many years of tertiary practice at the University of Florida and Murdoch University. Over the years he has mentored dozens of clinical residents and graduate students, and thousands of future veterinarians. Board certification in large animal medicine reflected years of specialist training. Dr Lester has a PhD and is the author of over 100 research articles and book chapters and has been invited to speak at conferences in many countries.

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  • Monensin (ionophore) toxicosis

    Monensin (ionophore) toxicosis

    Ionophore antibiotics are commonly used in food producing species as a treatment for coccidiosis in poultry and as a growth promotant in ruminants. The latter effect is due to their ability to improve feed efficiency and weight gain in ruminants. There are several commercially available ionophore antibiotics, including lasalocid, salinomycin, monensin, laidlomycin, maduramicin and narasin….


  • Updated rules of racing regarding cardiac arrhythmias

    Last year there were some important amendments to the rules of racing for Australian thoroughbreds. The first change centres on reporting a ‘cardiac arrhythmia’ and the need for the trainer and any person in charge of the horse to report the presence of a cardiac arrhythmia to relevant stewards immediately. The assumption here is that…

  • HISA – New strict regulations for racing veterinarians, trainers and others in the US

    The horseracing industry in the United States has been under heightened public scrutiny in recent years, partly in response to racetrack breakdowns and deaths, and an abuse of medications by some trainers. This has led to the Horseracing Integrity and Safety Act signed into Federal law in 2020. At its core is the creation of…

  • New Equine Influenza Video

    A new video that clearly explains the concept of antigenic drift in the Equine Influenza Virus (EIV) over time has been released. It is helpful in understanding the same concept in Human Influenza Virus. This video has been made by Merck Animal Health in the US and does advocate the use of their vaccine range….

  • University establishes leading veterinary facility at the newly constructed World Equine Center in Ocala, Florida

    University of Florida establishing a state-of-the-art veterinary centre at the World Equine Center in Ocala, Florida . I was fortunate to be involved in the planning of this facility while working at UF. This promises to be one of the leading equine sports medicine and rehabilitation facilities in the world. The hospital will also include…

  • Parasite advice for Veterinarians

    Parasite control options have shifted dramatically over the past decade. Dr Lester will be joining Dr. Anne Beasley and Dr. Dave Rendle in discussing current thinking on equine parasite resistance and control in the Australian setting. This webinar, hosted by Dr. Tania Sundra, is directed at veterinarians and is kindly sponsored by Virbac Australia. Details…

  • Japanese Encephalitis detected in Australia

    There has been concerning news that the Japanese Encephalitis (JE) virus has been detected in eastern Australia. The virus has been detected in piggeries in Queensland, New South Wales and Victoria. JE traditionally occurs in a widely dispersed areas in eastern Asia and until now, as far south as Papua New Guinea and islands of…