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

Compulsive Urinating on Hay

My 10-year old Paso Fino gelding consistently, and sometimes frantically, urinates on his hay. I have tried to place his hay where he can’t urinate on it, but he will try his hardest to get to it. Could this be some sort of “marking” behavior?

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Nip Nipping in the Bud

A few of our therapy horses are very mouthy. When they are in session and have a child on their back they try to nip at their leaders. We have a hard time correcting it because of the child. How do I help incoming horses not develop these habits?

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Earning Back Trust

Up until recently I have never had any behavioral issues with my 15-year-old Thoroughbred gelding. Awhile back he flipped out in the cross-ties with a new farrier. Since then he has been very upset to be shod in cross-ties. How can I calm him down?

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Self-Mutilation or Pain?

I have a horse that I believe is displaying a form of self-mutilating behavior, and I’m wondering if you have

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Trailer Loading Methods

Do you recommend a particular method for efficiently helping owners load their horses under these veterinary c

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Feet Feud

My horse has always been awesome about lifting his feet, but now he’s getting crabby about it. Some days he just won’t let me pick up his front feet at all. Any ideas on how to break this bad habit before it spreads to the back feet?

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New Herdmates

Ever since moving to a new barn, my horse has developed an extreme attchment to the other horses and has a completely different personality. He has become pushy and difficult to work with. Should I move him back home?

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To Breed, or Not to Breed?

A lot is asked of young show stallions, particularly when it comes to juggling performance and breeding. I wondered what your experience has been on this subject. Do you feel breeding can actually benefit the performance behavior?

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Unbalanced Behavior

Several months ago my gelding started having “tantrums” and displaying stallionlike tendencies and characteris

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Young Guns

Q: I would like to know at what age a colt could breed a mare. I have a 10-month-old colt that has been in with mares until recently, and I was told he could have bred my mares.


A: There are many

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Behavior: Strong Reaction to Strangers

Q: I have a 5-year-old headstrong mare with whom I have a good, solid bond. She works well on the ground and is a dream under saddle for me. She does not like strangers coming into the barn, and she counts my boarder’s farrier and

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Behavior: Discipline for Kicking and Striking

Q: We have a disagreement in our barn: How do you best handle immediate discipline for a horse that strikes out with both front feet or cow-kicks and knows better (not a young horse)? Those people in our barn who have Western

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