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

Pulling Ponies Won't Quit Grass Grabbing In-Hand

Learn how to keep ponies, Miniature Horses, and full-sized horses from pulling and grazing when you lead them. Read More

What Does 'Sacking Out' a Horse Mean?

Learn how to get your horse to accept new and scary objects or sounds. Read More

Messy Gelding vs. Tidy Gelding

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

Sunspot Spooking

Find out why horses spook at sunspots on the ground and what you can do to correct this behavior. Read More

Why Does a Horse Whinny?

Learn about equine vocalization and how horses might or might not use whinnies to communicate. Read More

Why Do Horses Nicker?

Dr. Nancy Diehl explains what we know--and don't know--about a horse's nicker. Read More

Help! My Horse Keeps Tossing His Head at Mealtime!

A veterinarian and equine behavior expert addresses a possible learned head tossing behavior at feeding time. Read More

Why Do Young Horses Champ Their Mouths?

Discover the possible reasons a foal or young horse might "gum" at an adult horse. 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

Do Horses Learn by Watching Each Other?

Sometimes it seems like horses pick up behaviors from each other. But it might be for reasons different than you think. Read More

What Can I Do About My Horses Rushing the Gate?

An equine behavior expert and veterinarian offers tips on handling horses that crowd and rush the gate at mealtime. Read More

What's the Difference between a Vice and a Stereotypy?

Dr. Nancy Diehl considers the use of "vice" and "stereotypies" when referring to horse behavior. Read More

Why Does a Horse Shake His Head?

What causes horses to shake their heads, and how can this issue be resolved? Read More

Do Horses Need Man-Made Shelters?

When given the option, horses often use behavioral thermoregulation to protect themselves from inclement weather. Read More

How to Introduce Horses

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

How to Teach a Horse to Drink from an Automatic Waterer

A veterinarian and horse behavior expert offers advice for introducing your horse to an automatic waterer. Read More

Is It Okay for My Horse to Live by Himself?

Vet and equine behavior expert Dr. Nancy Diehl shares the reasons horses live best in groups. Read More

What Should I Do if My Horse Panics at the Electric Fence?

A veterinarian and horse behavior expert addresses a senior horse's bad experience with an electric fence. Read More

Why Does a Horse Buck?

An equine behavior expert and veterinarian explores the reasons why a horse might buck. Read More

How Can I Tell if My Horse is Stressed?

Our expert shares her thoughts on what causes stress for horses and how they respond to stressful situations. Read More

Why Does a Horse Lie Down?

Learn about equine sleep patterns and how to tell if the amount of time your horse spends lying down is normal. Read More

How Can I Tell if My Horse is in Pain?

Learn the signs that your horse's behavior might be related to pain from a veterinarian and equine behavior expert. Read More

How Do I Get My Horse to Respect Me?

Dr. Nancy Diehl shares how you can earn your horse's respect through consistent training. Read More

Does My Horse Love Me?

Do we know if horses feel love toward humans and each other? Read More