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

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

How Much Grain Should I Feed My Colic-Prone Horse?

An owner with a colicky horse is worried that grain could be the culprit and wants to know how much to feed. Read More

Resolve to Weigh Your Horse's Feed

Do you want to make sure your horse is getting the right amount of feed? Use a scale! Read More

Feeding Older Horses With PPID, IR, or Metabolic Disease

Are there any parameters for offering senior feeds to horses diagnosed with Cushing's and laminitis? Read More

When is an Older Horse Ready for Senior Feed?

As horses age, they might require additional nutritional support. Get advice for feeding senior horses. Read More

Risks Associated With Feeding Horses Traditional Bran Mashes

While steeped in tradition, feeding bran mashes can cause GI distress in horses. Learn why, and discover alternatives. Read More

Can Fat Help Horses Gain Weight in Winter?

Find out how to safely feed horses fat and if it's a good weight-gain solution. Read More

Can Horses Eat Citrus?

A reader asks about the risks and benefits of her horse eating a favorite treat: grapefruit. Our nutritionist weighs in. Read More

Fall Colic Prevention for Horses

Nutritionist Dr. Clair Thunes shares advice on how to reduce your horse's risk of colicking this fall. Read More

Tips for Feeding Horses in a Group

Does your herd leader get too much to eat while the low man doesn't get enough? Here's our expert's advice. Read More

A Short Guide to Horse Hay Analysis

A horse owner asks if hay analysis is necessary. Our nutrition expert offers an answer and advice on getting a sample. Read More

Processed Horse Feeds: A Balance of Pros and Cons

Human nutritionists encourage eating whole foods and avoiding processed ones. Does the same logic apply to our horses? Read More

Fish Oil as an Omega-3 Source for Horses

Omega-3 fatty acids offer horses health benefits, but are fish sources okay for horses to eat? Read More

Senior Feeds and the Unthrifty Horse

I used a senior equine feed to help my hard keeper gain weight. Now, should I switch him to a low-NSC product? Read More

Increasing Chew Time for Hay Cubes and Pellets

Horses can consume hay pellets or cubes rapidly. How can we slow them down to increase their time spent chewing? Read More

Pros and Cons of Feeding Horses Beet Pulp

An equine nutritionist answers common questions about beet pulp. Read More

Protecting Your Horse From Poisonous Fall Leaves

Is it okay for my horse to eat leaves that have fallen from trees in his pasture? Read More