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

Weaving: Are Mirrors the Answer?

Are stall mirrors recommended for horses that weave, and where could I find one that is safe and economical? Read More

Death of a Herdmate

Can the death of one horse lead to a complete change in another's behavior or "personality"? Read More

Twitch Efficacy and Endorphin Levels

Learn about applying a lip twitch and the endorphin release that occurs during application. Read More

Strange Stance for Shoeing

Learn why one gelding acts odd during farrier visits. Read More

Dealing With Enthusiastic Learners

Learn how to modify an overzealous carrot stretcher's behavior. Read More

A Love-Hate Relationship

Learn why a horse gets bullied by her herdmate. Read More

Electric Fencing

Can electric fencing be used to separate a stallion from other mares and geldings on the property? Read More

Reversing Fear-Based Behavior

An owner inquires about how to address and reverse her horse's fear-based behavior. Read More

Contempt for Cats

How do you correct a misbehaving horse that hates cats? Read More

Situational Queen Bee

Find out why a mare might be guarding her caretakers during feeding. Read More

My Filly has No Respect or Fear of Anything. What Can I Do?

An equine behaviorist offers advice for managing an orphaned filly who exhibits dangerous behaviors. Read More

Stallion Libido

My stallion shows little or no signs of libido with my mare. He won't even "talk" to her. What can I do? Read More

How Can I Stop a Horse from Striking?

What can be done to correct a horse that strikes at the ground, stall, water tank, and fence? Read More

Physical vs. Psychological Issues

How does a veterinary behaviorist know for sure something is or is not a psychological problem? Read More

Calming a Mustang Stud

Last fall I adopted a wild mustang stud. Would gelding him help calm his wild attitude? Read More

Why is My Horse So Grumpy?

Why does my horse pin her ears all the time, but she doesn't kick or bite and seems to like attention? Read More

Tranquilizers for Riding

Should tranquilizers be used to help calm a horse down so it can be ridden? Read More

Horse Won't Cross Railroad Tracks

My horse is great about nearly everything, but he will not cross railroad tracks. What can I do to help him? Read More

Antsy About Urinating

My 6-year-old OTTB gets very nervous and dances around whenever he has to pee. What might cause this behavior? Read More

Happy and Unhappy Horses at Home

Has any research been done regarding what horses might like and dislike about their homes? Read More

Mare Expelled

My gelding will not let my mare get close to the other horses. What can I do to help them happily coexist? Read More

Foaling Location

Why would a mare prefer to foal in a field versus in a foaling stall or in the barn? Read More

Breeding Dummy Design

Are there size recommendations for a building a breeding dummy for a Quarter Horse stallion? Read More

Bonding with a Trail Buddy

How quickly can horses bond, and what can be done to help reduce their anxiety when they're separated? Read More

Mare Aggression

My mare is very aggressive toward geldings and will kick out when they're close. Why would she react this way? Read More