Clair Thunes, PhD

Clair Thunes, PhD, is an independent equine nutrition consultant who owns Summit Equine Nutrition, based in Sacramento, California. She works with owners/trainers and veterinarians across the United States and globally to take the guesswork out of feeding horses. Born in England, she earned her undergraduate degree at Edinburgh University, in Scotland, and her master’s and doctorate in nutrition at the University of California, Davis. Growing up, she competed in a wide array of disciplines and was an active member of the United Kingdom Pony Club. Today, she serves as the regional supervisor for the Sierra Pacific region of the United States Pony Clubs. As a nutritionist she works with all horses, from WEG competitors to Miniature Donkeys and everything in between.

Articles by Clair Thunes

Improving Dry Equine Skin and Coats With Nutrition

Do you have a horse with flaky skin and a dry mane and tail? The right feed might help. Read More

Anhidrosis in Horses

Our equine nutritionist and physiology expert offers advice on managing horses that have stopped sweating. Read More

Is There a 'Right Kind of Salt' for Horses?

An equine nutritionist addresses the different types of salt available and how to pick the right one. Read More

Algae in Horse Water Troughs: Is It Safe?

Our nutrition expert offers tips for keeping algal blooms to a minimum in your horse's water trough this summer. Read More

Feeding PPID Horses

Our nutrition expert explains how diet changes can help horses with pituitary pars intermedia dysfunction (PPID). Read More

Nutrition and the Equine Topline

Find out how proper nutrition, including high-quality protein, could help improve muscling over your horse's back. Read More

How to Introduce and Use a Grazing Muzzle for Horses

An equine nutritionist offers tips for reducing your horse's pasture intake with a grazing muzzle. Read More

Senior Equine Feeds and Fiber

Our equine nutritionist explains why senior feeds are high in fiber and why that's good for your older horses. Read More

Should I Feed My Horse Garlic to Repel Insects?

Our equine nutritionist takes a closer look at garlic's potential to fight off flies and biting insects. Read More

Understanding Calories and Energy for Horses

In most cases, energy requirement recommendations are an estimate of what a horse needs. Read More

More Work Might Mean Your Horse Needs More Calories

Have you increased your horse's workload this spring? Find out how to safely increase his energy intake to match. Read More

Getting Ready for Rolex: By the Numbers

How many trot sets and calories does a horse require to get Rolex-ready? Join "Forty" as he preps for the grueling test. Read More

Feeding Type-1 PSSM Horses

Balanced nutrition and exercise can help horses with type-1 PSSM lead active, healthy lives. Read More

How Long Can I Store Horse Feed?

Your feed store is having a big sale, but here are some tips before you stock up. Read More

How Do I Transition My Horse to Pasture?

Our equine nutritionist shares tips for keeping your horse healthy and your pastures in good shape this spring. Read More

Choosing Hay for a Yearling Horse

Our nutrition expert considers grain hays, grass hay, and alfalfa for feeding growing horses. Read More

What is a Nutraceutical?

Are you confused about nutraceuticals in your horse's diet? Learn more from our equine nutrition expert. Read More

DMG and Creatine in the Equine Diet

Do these supplement ingredients improve performance? Read More

How to Feed HYPP Horses

What kind of diet should a horse with HYPP consume to help keep clinical signs at bay? Read More

Protein and Equine Ration Balancers: Let's Do the Math

Nutritionist Dr. Clair Thunes explains why ration-balancer protein contents might seem high but aren't. Read More

Do Horses Need Vitamin D Supplementation?

If you live at northern latitudes, you might lack vitamin D. But what about your horse? Read More

Nutrition Loss in Stored Hay

Is your hay more than six months old? Then it might be losing vitamin A and E. Read More

Will Whey Protein Improve My Horse's Topline?

Our equine nutrition expert addresses toplines, horse protein needs, and whether whey is the way to go. Read More

Why Does My Horse Chew Wood?

Our equine nutrition expert offers advice to keep horses from chewing on barn wood and fenceposts. Read More

Do Pre- and Probiotics Help Horses?

A nutritionist looks at the relevant, if limited, research about pre- and probiotics in the equine diet. Read More