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

Older Creature Comforts

I'm concerned about my senior horse's mental happiness. How can I keep him comfortable and happy? Read More

Scared Horse? Try Counter-Conditioning

Learn how to teach your horse an alternate response to triggering stimuli. Read More

Watching the Herd

How can watching horses interact in a herd help improve my relationship with my horse? Read More

Equine Behavior Changes Before Death

Have horses been known to show significant behavior changes right before death? If so, why does this happen? Read More

Spooky Objects: To Dwell or Not to Dwell

Should you let a horse dwell on a spooky object? Read More

Are Appeasing Pheromones Effective in Horses?

How effective are appeasing pheromones for reducing nervousness or anxiety in horses? Read More

Is There Such Thing as a Highly Sensitive Horse?

Is it possible that some horses, like people, are born with a highly sensitive nervous system? Read More

Behavior Contest Winner: An Obsessive Licker

Our "Why Does My Horse Do That?" winner wants to know why her mare's buddy licks the mare after meals. Read More

Unbridled Discomfort

My horse is "reverse bridle shy." What can I do to help this habit? Read More

The Science Behind 'Licking and Chewing' in Horses

What does "licking and chewing" really mean? Read More

Spontaneous Rearing and Food Aggression in Horses

One mare's rearing habit around her owner might be play initiation. Read More

Common Senior Horse Behavior Problems

What is the most common behavior problem or case you see in aging horses? Read More

Stubborn as a Donkey?

One behavior expert explains the differences in behavior between donkeys and horses. Read More

Gelding Behavior

My gelding has been dropping his penis more than usual. Could this be related to him being turned out with a mare? Read More

Geldings that 'Drop' During Training

Could a relaxed mental state caused by positive reinforcement training also be associated with penile relaxation? Read More

Positively Playful

My 5-year-old gelding is very playful. Can I turn his playfulness into an advantage when I train him? Read More

Managing Mouthiness

My gelding is very mouthy. Should this behavior be curbed, and how can I accomplish this? Read More

Minimizing Foal Stress Levels in the Breeding Shed

What would be the best plan for handling a foal whose dam is being covered by a stallion? Read More

Does a Racehorse Know if He Wins or Loses?

And what difference would it make to the horse if he wins or loses? An equine behaviorist weighs in. Read More

Tail Blocking's Effects on Horse Communication

If a horse's tail has been nerved, is he at a social disadvantage when turned out with others? Read More

An Old Horse Starts Cribbing

My 17-year-old horse started trying to crib recently, which I have never seen him do before. Why would he start now? Read More

A Spooky Senior Horse

An equine behavior expert weighs in on how one reader can help her senior OTTB be less spooky at home. Read More

Common OTTB Behavior Traits

I'm considering purchasing an ex-racehorse. Are there any common behavior problems in OTTBs that I should be aware of? Read More

Problems in Passing Other Horses in the Arena

What can I do to help my horse get over his fear of other horses coming toward him or passing him in the arena? Read More

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