—Marty Ward, Medford, Ore.
A: Thank you for asking this highly relevant question. I fully agree with your veterinarian. To deworm a horse every other month is a serious overtreatment. In the best case it is not needed and is a waste of medicine and money and, at worst, such treatment regimens inevitably lead to resistant parasites.
You do not mention your horse’s age, but I assume he is an adult. Adult horses most often require only one or two treatments a year, and many may not need any treatments at all. If he is in good health and a fecal sample does not reveal any parasite eggs, there is simply no incentive to
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