Nancy Diehl, VMD, MS

Prior to attending veterinary school, Dr. Nancy Diehl completed a master’s degree in animal science while studying stallion sexual behavior. Later, she completed a residency in large animal internal medicine at the University of Pennsylvania’s New Bolton Center and worked in equine practices in Missouri and Pennsylvania. Diehl also spent six years on faculty at Penn State, where she taught equine science and behavior courses and advised graduate students completing equine behavior research. Additionally, Diehl has co-authored scientific papers on stallion behavior, early intensive handling of foals, and feral horse contraception. Currently she is a practicing veterinarian in central Pennsylvania.

Articles by Nancy Diehl

How Do I Train My Horse to Accept Fly Spray?

Dr. Nancy Diehl shares her thoughts on using clicker training to help a horse get used to having fly spray applied. Read More

How to Introduce Horses

An equine behavior expert and veterinarian shares recommendations for introducing horses that will live together. Read More

Are Stall Toys Good for Horses?

A horse behavior expert weighs in on whether she believes horses benefit from toys. Read More

How Do I Get My Horse to Respect Me?

An equine behaviorist describes how you can earn your horse's respect through consistent training. Read More

How Do Mares Protect Their Foals?

An equine reproductive behavior expert shares insight into how mares and herds will ward off danger to their young. Read More

Messy Gelding vs. Tidy Gelding

An equine behavior expert addresses a question about two geldings with very different poop patterns. Read More

How Can I Tell if My Horse is in Pain?

A veterinarian and an equine behaviorist describes behavioral signs of pain in horses. Read More

Do Equine Genetics Influence Behavior?

An equine behavior expert and veterinarian explains the role that genetics play in a horse's behavior. Read More

How Can I Tell if My Horse is Stressed?

Learn about what causes stress for horses, how they respond to stressful situations, and what we can do about it. Read More

Why Do Horses Weave?

Find out why a horse might start weaving and what, if anything, you can do about this stereotypy. Read More

Teaching a Horse to Have a Blanket Put Over His Head

How can I teach my horse to let me put her blanket on over her head so I don't have to unbuckle it each time? Read More

Why Do Horses Roll After Baths?

An equine behavior expert considers the reasons why horses might roll after baths. Read More

What is a Flehmen Response?

Discover why your horse is curling his upper lip. Read More

Common Human-Equine Interaction Misconceptions

Dr. Nancy Diehl shares her views on things that can cause horse-human communication to go awry. Read More

Why Does a Horse Bite?

Researchers have developed a list of reasons a horse might bite. Learn the causes and how to train a horse not to nip. Read More

Help, My Horse Won't Get Out of the Trailer!

A Facebook fan asks for help with his horse, who's become a reluctant unloader. Read More

Do Horses Recognize Humans?

Dr. Nancy Diehl shares research results that indicate whether or not horses recognize their people. Read More

Why are Two Siblings Out of the Same Mare so Different?

An equine behavior expert addresses contradictory characteristics between foals out of one mare born different years. Read More

Does My Mare Think a Miniature Horse is Her Baby?

In response to a reader question Dr. Nancy Diehl shares insight on equine maternal instincts, foal stealing, and more. Read More

How Do I Get My Horse to Load in a Trailer?

An equine behavior expert offers training tips for making trailer loading drama free. Read More

Can a Mare's Personality Change After Her First Foal?

Dr. Nancy Diehl addresses a question about why a mare might respond differently to training after having her first foal. Read More

Orphan Foal Behavior

An equine behavior expert offers advice on raising and training an orphan foal to reduce future unwanted behaviors. Read More

Normal Mare and Newborn Foal Behavior

Find out what to expect as your mare goes into labor and during your foal's first hours of life. Read More

Managing Breeding Stallions

Dr. Nancy Diehl offers advice on keeping stallions happy and safe during routine handling and breeding. Read More

Differences Between Mares and Geldings

Dr. Nancy Diehl addresses common behavior differences between mares and geldings and their causes. Read More