Skipped Beats, Sudden Death… and Why We Shouldn’t Worry Too Much. When you first start examining patients as a veterinary student, you’re very keen to (gently) poke and prod every animal you come across. Realizing you can assess cardiovascular function by palpating peripheral pulses is very empowering!

Respiratory disease is one of the most important health concerns facing the horse industry, and accounts for one of the biggest reasons why horses miss training days (Rossdale et al., 1985). Equine asthma, also known as “heaves,” is one of the more troublesome small airway diseases which causes an elevated respiratory rate, chronic coughing and runny nose, and affected horses often find it difficult to exhale.

The equine respiratory tract is responsible for many different functions and is, on a basic level, quite similar to the human respiratory tract. One of its primary functions is the exchange of oxygen between the lungs and the red blood cells, which allows oxygen to be delivered to tissues throughout the body and becomes especially important during exercise when the oxygen consumption of the tissues increases. Another important function is the clearance of irritants such as dust, ammonia, and bacteria, from the respiratory tract. This is done by filtering large dust particles in the nose, coughing, sneezing, and trapping irritants in the airway mucus. However, excess nasal discharge, coughing, sneezing, and mucus secretion are all signs that a horse may be suffering from respiratory problems.

Horses are very proficient sweaters, making them some of the most efficient animals at cooling themselves — but they are still at risk for heat stress. There are many ways we can help them sidestep this risk as the temperatures heat up. Below, I’ll cover diminished electrolytes, groups of horses at greater risk, signs of heat stress, and tips to keep your horses safe.