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

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

Determining Personality

How can a horse purchaser check out elements of a horse's character at the purchase exam? Read More

Rushing a Mare During Breeding

What might be causing a stallion to mount a particular mare early, and what can be done about it? Read More

Feeding Time Pawing

Do you have any suggestions for stopping a horse from pawing while he is eating his grain? Read More

Horses Afraid of Other Species

We were told that it's dangerous to have pigs with horses. Have you ever heard of this? Read More

Rude for Food

How do I change a colt's rude behavior at feeding time without scaring him? Read More

Sudden-Onset Cribbing and Headshaking

My pony started tossing his head and cribbing at about the same time. What could cause this problem? Read More

Fear of Cows

My horse is terrified of cows. Is there anything I can do to help him? Read More

Unpredictable Fear

Learn what "sacking out" is and whether it might work for a mare with unpredictable fear. Read More

The Messy Mare

Why does my mare return to her stall to urinate and defecate when she has a large run and could do so outside? Read More

Horses That Are Bonded

I've read that uneven numbers aren't good due to pair bonding. Is this true? Read More

Trailer Troubles

Do you have any recommendations for how we can help a horse overcome a trailer loading problem? Read More

What's In a Yawn?

Is yawning an indicator of stress in horses? Read More

Trailer Loading Lessons

What techniques I should use during a trailer loading lesson with a naive filly? Read More

Recognizing Humans

Is it common for horses to respond differently to different people in the same situation? Read More

Can Horses Think Through Problems?

Do horses have the capability to think through a problem, like unlatching a gate? Read More

Age to Breed a Colt

Our coming 2-year-old acts like he is ready to breed. How young is too young to breed a colt? Read More

Water Bucket Blues

Why do horses tip water buckets, defecate in waterers, and/or dip hay in their water? Read More

Separation Anxiety In Horses

Learn what predisposes certain horses to separation anxiety and what we can do to prevent it. Read More

Controlling Cribbing in Horses

How can I work with a cribber so he can stop wearing his cribbing collar? Read More

Biting and Snapping Pony

How should I handle a pony that tries to attack people when they enter his stall? Read More