Summer

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A hot humid day. One rider. One horse. Both are exercising at a moderate level. Who is more likely to overheat? It might surprise you to learn that your horse gets hotter much faster than you and is more susceptible to the negative effects of heat stress. Prof. Michael Lindinger, an animal and exercise physiologist at the University of Guelph, explains: “It only takes 17 minutes of moderate intensity exercise in hot, humid weather to raise a horse’s temperature to dangerous levels. That’s three to ten times faster than in humans. Horses feel the heat much worse than we do.”

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Parasite prevention remains a vital part of maintaining horse health—but gone are the days when you could rely on a routine deworming every eight weeks with the same product.

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How flies spread parasites and disease - Flies are the bane of many horses’ existence from spring through autumn. In Canada, horse-biting flies include gnats (no-see-ums), black flies, stable flies, deer flies, horse flies, and mosquitoes, all of which create painful sores. Non-biting flies include house flies, eye gnats, face flies, bot flies, and warble flies, and can be just as irritating. It’s not just buzzing and biting that’s worrisome; flies may transmit parasites and diseases, can cause a horse’s immune system to overreact, and some use horses as hosts, all of which impact horse health. Preventing horses from being bitten is key. Before diving into solutions, here’s a summary of the damage that flies can inflict on Canada’s horses.

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As horses exercise, their core body temperature climbs. To prevent overheating, the body relies heavily on sweat evaporation to cool down. Sweating is essential during physical activity, but it leads to the loss of both water and vital electrolytes. These include sodium, chloride, potassium, calcium, and magnesium—key minerals that support nerve function, hydration, and muscle activity. Without proper replenishment, electrolyte depletion can impair performance and compromise your horse’s well-being. Supporting your horse’s recovery means restoring both water and electrolyte levels in appropriate proportions.

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Not much can gross out a horse person. We happily pick out hoofs, observe the quality of manure, scrape bot eggs off our horses’ legs, and get a weird sense of satisfaction from an expressed abscess. But ticks… ticks are just nasty.

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Spring is a season of renewal on the horse farm — but it’s also a time when risk rises sharply. Melting snow, saturated ground, drying grass, and volatile weather patterns can quickly turn routine days into emergency situations. Gradual flooding and flash floods, grass and structure fires, severe storms, rapid snow melt, and ice jams that block water flow can threaten horses, people, and infrastructure with little warning. Add in secondary risks such as power outages, water contamination, disease outbreaks, and damaged fencing, and it becomes clear that emergency preparedness isn’t optional — it’s essential.

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What Every Horse Owner Should Know - As summer arrives, veterinarians and horse owners across Canada grow increasingly concerned about Potomac Horse Fever (PHF). Once rare, the disease is appearing more often in regions north of the United States. Potomac is now considered endemic in Ontario, Quebec, Nova Scotia, Manitoba, Alberta, and British Columbia.

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If there’s one word that strikes fear into the hearts and minds of horse owners, it’s “colic.” Used to describe any form of abdominal pain, colic can affect horses for many reasons and in any season, although cold weather months are a particularly challenging time with increased risk of impaction-related colic.

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As the grip of winter begins to fade, anticipation builds for longer rides and a return to regular activity. While Canadians are well known for embracing snow and sub-zero temperatures, most horse owners are more than ready to welcome milder days and the renewed energy that spring brings.

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Take an inside look into the latest the scientific studies at the University of Saskatchewan's veterinary college, with the Western College of Veterinary Medicine's semi-annual newsletter: Horse Health Lines.

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