Sue McDonnell, PhD, Certified AAB

Sue M. McDonnell, PhD, is a certified applied animal behaviorist and the founding head of the equine behavior program at the University of Pennsylvania’s School of Veterinary Medicine. She is also the author of numerous books and articles about horse behavior and management.

Articles by: Sue McDonnell, PhD, Certified AAB

Horse Behavior: War on Punishment

Question from a reader:

I see the American Veterinary Medical Association (AVMA) has posted a statement from their American Veterinary Society of Animal Behavior (AVSAB) about the use of punishment for behavior

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Stubborn or Fearful?

Q: Recently, I was working with a group of veterinary students and a patient. It was a colt that had experienced minimal handling or training for leading before arriving at the hospital. On the way to his stall, he needed to be

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Natural Stallion Behavior

Q: I own a Lusitano stallion that has been stabled at the same barn for four years. Within the past four to six months, he has shown increasingly aggressive displays toward two stallions that walk in front of his stall. He kicks an

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Potty Problems

I have a serious problem with my 3-year-old Warmblood filly I recently purchased. I had her extensively vette

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Training a One-Eyed Horse

Working with visually impaired horses has been mostly with those that lost vision as an adult, after they had been trained. And, in general, the horses I have worked with directly have impressed me with how adaptable they have been with losing vision

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Raising a Stud Colt

Can you offer any general guidelines on how raising and handling a young stud would differ from raising fillies?

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Becoming a Behaviorist




Veterinarians and nonveterinarians can pursue this growing field.



What does it require to pursue a career as an animal behavioral consultant? I’ve heard the question a number of times.

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Pawing Problem

Is there a humane method for breaking my 4-year-old Missouri Fox Trotter mare from pawing?

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Calming Mother Nature

Q: I have a 7-year-old Quarter Horse mare that is quite “the mare.” When she is around the geldings (even if they are in different pastures) and in season, she will put her butt up to the fence and wink (the vulvar lips), etc. She

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Crossing Bridges

My horse refuses to cross a wooden bridge. I walked him across plywood for about three days and had no trouble.

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Bad-Asses

Why do mules and donkeys have heightened “territorial” or protective instincts when compared to horses?

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Best Breeding Approach

Q: For a horse reproduction project in my equine seminar course, I was trying to find video clips of horses breeding. Well, there were many on YouTube, and it took awhile to find the decent ones. But once I found some that were

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Anabolic Steroid Effects

A colleague, Larry Soma, VMD, is an anesthesiologist/pharmacologist who conducts research for the Thoroughbred and Standardbred horse racing commissions in Pennsylvania. Basically, his lab develops and validates testing methods for detection of

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Oral Attacks

Q: We have an Arabian who, for some reason, has taken to chewing on the horse trailer when we are at a show. He has never done this before. He started gnawing on the fender. We tied him away from the fender, and he started chewing

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Defecation Behavior

Why do some horses at our barn poop in the same place every time, then some others seem to go anywhere?

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Smart Mare, Smarter Vet

I am doing some positive reinforcement-based behavior modification for needle shyness in a draft broodmare. This mare is just too big and strong for the old-fashioned restraint methods of working around the problem. She has quite a repertoire of

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