Doug Byars, DVM, Dipl. ACVIM

Doug Byars, DVM, Dipl. ACVIM, is Director of the medicine clinic at Hagyard-Davidson-McGee equine practice in Lexington, Ky.

Articles by Doug Byars

Taking a Horse's Heart Rate

The easiest place to take a horse's heart rate, or pulse, is the mandibular artery located under the jaw. Read More

Checking the Vitals: Is My Horse Sick? How Sick?

Being familiar with your horse's normal resting temperature, pulse, and respiration rates (TPR) help you recognize when things are abnormal. The TPR vitals help you determine "how abnormal." Remember, vitals taken after the horse has been worked Read More

Checking the Vitals: The Lungs

Because can't tell a horse to "take a deep breath," listening to his lungs requires the following techniques. Read More

Checking the Vitals: Heart Function and Sound

The function of the heart is purely as a magnificent pump. It fills and empties thousands of times a day. There are four chambers, when divided into two sides, ad the left and right side each performs its functions to transport blood to the cells of Read More

Checking the Vitals: Abdominal Sounds

Unlike heart and respiratory rates, abdominal sounds do not punch a specific time clock for generating "gut sounds." The rhythmic peristaltic churning of food mixed with fluids within the gut varies in slower waves depending on meal time, the meal it Read More

Rabies Danger, Exposure Cost Reinforce Equine Vaccination Need

Rabies is a rhabdovirus that has been a human threat since antiquity. The virus is capable of infecting all warm-blooded animals with some variation in susceptibility. Rabies is considered 100% fatal to the infected host. However, in order for Read More

"Sticky" Third Eyelid

Q: Twice, my 12-year-old Paint gelding has gotten his third eyelid "stuck" over the top of his eyeball for 10 or 20 seconds. The first time was when water splashed in his eye during a bath. He tossed his head, rolled his eye upward Read More

Insulin Resistance and Layup Time

Q: My 18-year-old Percheron/ Morgan gelding was diagnosed with insulin resistance. Just prior to being confined to stall rest for a connective tissue injury, his insulin was 67 microIU/mL. The vet did a dexamethasone suppression Read More

Comparing Humans and Horses

Comparisons of humans to horses logically can start with the anatomy. We stand upright; horses stand prone on their four limbs. What we call our knees are the stifles of horses, and our heels or ankles are horses' hocks. Our foot is their cannon Read More

Research... Missing Dollars

Leaders in veterinary research and the equine industry should develop policy initiatives that recognize needed changes in the research landscape. Equine medicine remains grossly underfunded. As companion animals, horses receive few government Read More