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Can Horses Have Watermelon? Dos and Don’ts

With my background in equine nutrition, I’ve seen firsthand the joy this simple treat brings to horses. 

You’ve come to the right place if you’re curious about sharing this summer favorite with your horse. 

This article unpacks the dos and don’ts of feeding watermelon to horses, tackling safety, nutritional benefits, and proper feeding techniques. Whether you aim to pamper your horse or navigate dietary concerns, we’ll provide the insights you need. 

Watermelon for Horses: All the Good Stuff

Think of watermelon as a summer bonus for horses. It’s packed with goodies and great for keeping them hydrated. Here’s the scoop on why it’s so good:

Keeping Horses Hydrated

Watermelon is like a big drink of water. It’s about 90% water, which helps with everything from digestion to keeping cool and flushing out toxins. It even makes chewing easier because it boosts saliva, which is great for their teeth and tummy.

What’s Inside

  • Sweet but Safe: The sugar in watermelon gives a quick pick-me-up without the downside of too much sugar.
  • Vitamin A: Good for seeing clearly, fighting off germs, and keeping skin healthy.
  • Vitamin C: It’s like a shield for cells, helping fix up any wear and tear and keeping sickness at bay. Plus, it’s extra helpful for older horses or those feeling stressed.
  • Muscle and Bone Helpers: Magnesium in watermelon keeps muscles and nerves working smoothly, making horses feel more chill. Phosphorus keeps bones and teeth strong.

Watermelon Rind: Fiber and Citrulline for Horses

When we enjoy watermelon, we often throw away the rind. But for horses, that rind is a treasure trove of goodness. Let’s talk about what’s in it and why it’s great for your horse.

Fiber: Good for the Gut

The rind of a watermelon is packed with fiber. Fiber is a big deal for horses because it keeps their digestive system running smoothly. 

It helps with regular bowel movements and can prevent some common tummy troubles like colic. Eating the rind also means horses chew more, which is good for their teeth and helps make more saliva. This helps their digestion right from the start.

Citrulline: For Muscles and Blood Flow

There’s something else in the rind called citrulline. This amino acid does something pretty cool: it changes into another amino acid that helps relax and widen blood vessels. 

Why is this good? 

It means blood can flow better around the horse’s body. After a workout, this helps muscles recover faster by getting them the nutrients they need and carrying away waste. It’s like making sure the highway is clear for all the delivery trucks and garbage trucks in the body.

So, when you’re slicing up watermelon for yourself, don’t toss that rind. Cut it up into small pieces and share it with your horse. It’s a tasty treat that’s also packed with benefits.

How to Feed Watermelon to Horses

Here’s how you can feed your horse watermelon safely and ensure it enjoys every bite!

Choosing the Right Watermelon

Before you even get to washing and cutting, picking the right watermelon is crucial. You want a ripe, sweet, and juicy one for your horse to enjoy. Here’s how to choose the best watermelon:

  • Look for a uniform shape: Whether round or oval, the watermelon should be consistent. Irregularities might indicate uneven ripening or poor growth conditions.
  • Check the field spot: This is the area where the watermelon rests on the ground. A creamy yellow or light brown spot indicates ripeness, while a white or green spot suggests it’s underripe.
  • Give it a tap: A ripe watermelon will have a deep, hollow sound when you tap it. If it sounds dull, it might not be ready to eat.
  • Feel the weight: A ripe watermelon will feel heavy for its size, indicating a good water content, which is what you want for hydration.

Preparing the Watermelon

After picking the perfect watermelon, follow these steps to prepare it for your horse safely and effectively.

Step 1: Washing the Watermelon

  • Why It’s Important: Washing removes potential pesticides, dirt, and bacteria from the rind. Even though you won’t feed the outermost layer, cutting through an unwashed melon can drag these substances into the flesh.
  • How to Do It: Use cool running water and a clean brush for food use. Gently scrub the entire surface of the watermelon to ensure it’s clean.

Step 2: Cutting the Watermelon

  • Safety First: Knife safety is paramount, so this task is for adults. Use a sharp knife and a stable cutting surface to avoid accidents.
  • Size and Shape: Cut the watermelon into slices or chunks that are manageable for your horse. If you’re including the rind, ensure the pieces are small enough to prevent choking but large enough to be chewed properly.

Step 3: Feeding

The Right Amount: Treats should make up a small portion of your horse’s diet. As a guideline, a couple of chunks or slices per day is plenty. This keeps their diet balanced and prevents overindulgence.

Frequency: Offering watermelon as a treat a few times a week during the summer is a good practice. It adds variety to the horse’s diet without disrupting their nutritional balance.

Creative Feeding Ideas for Watermelon

Offering watermelon to horses can go beyond simple slices. Here are some inventive ways to incorporate this hydrating treat into your horse’s diet.

Watermelon Chunks: A Hydrating Bite

  • What It Is: Small, bite-sized pieces of juicy watermelon flesh.
  • Best For: Quick rewards during training or a cool snack on warm days.
  • Tips for Success: Cut into sizes that are safe and easy for your horse to eat. Make sure to remove seeds to prevent any digestive issues. This method provides a burst of hydration and a healthy dose of natural sugars for energy.

Chopped and Frozen Watermelon: The Cool Treat

  • What It Is: Refreshing, frozen watermelon pieces.
  • Best For: Offering a chilled treat to help your horse beat the heat.
  • Tips for Success: Dice watermelon into small, manageable pieces and freeze. Serve as a standalone snack or mixed with other fruits for variety. This approach not only cools your horse down but also adds important vitamins to their diet.

Frozen Watermelon Blocks: Fun and Hydration

  • What It Is: Ice blocks infused with watermelon for a lasting treat.
  • Best For: Encouraging hydration and play on hot days.
  • Tips for Success: Freeze watermelon chunks in water-filled buckets. Watch as your horse enjoys licking and chewing on the ice, ensuring they stay hydrated and get nutrients.

Bran Mash Mixtures: Comforting and Nutritious

  • What It Is: A warm bran mash with the added sweetness of watermelon.
  • Best For: A heartwarming treat in cooler weather or simply to pamper your horse.
  • Tips for Success: Stir fresh watermelon chunks into your usual bran mash recipe before serving. This not only warms your horse but also provides a fiber-rich meal with the added benefits of watermelon’s vitamins.

Safety Considerations When Feeding Watermelon to Horses

Feeding your horse watermelon is like giving them a slice of summer joy. But, doing it right means keeping a few important things in mind. Let’s break it down simply.

On Seeds and Rinds

Seeds: They’re not harmful but can be a choking risk. It’s like when you accidentally swallow a watermelon seed and it feels weird. For smaller horses or those that eat fast, it’s best to pick the seeds out first.

Rinds: They’re actually good for horses because they’re full of fiber. But too much of a good thing isn’t great, right? Cut them up small to keep things easy on their stomach and prevent any choking scares.

Washing Off the Nasties

Pesticides and Stuff: Just like we wash veggies before eating, watermelons need a scrub. This gets rid of any bad stuff on the outside that shouldn’t end up inside your horse.

Germs: The outside of a watermelon can hang onto bacteria, including some really bad ones like E. coli. A good rinse and scrub make sure you’re not slicing those germs into the part your horse will eat.

Sharing Treats with Other Horses

Always Ask First: If it’s not your horse, make sure you have a green light from their owner before sharing treats. What’s yummy to one horse might not be okay for another, especially if they have special diet needs or health issues.

Be Careful: Dropping treats into a group of horses might stir up trouble. They could start squabbling over who gets the tasty bits, and nobody wants to see that happen.

Concerns with Overfeeding Watermelon to Horses

Treating your horse to watermelon should be done with care to avoid any health hiccups. Here’s what to watch out for when it comes to overfeeding.

The Sugar Situation

Watermelon is sweet and refreshing, but it’s the natural sugars in it that we need to think about. Compared to other treats, watermelon is pretty light on sugar, but it’s not sugar-free. A slice of watermelon has less sugar than, say, an apple or a banana, but those sugars can add up if you’re not careful. Too much sugar isn’t good for horses, just like it isn’t for us.

Overfeeding and Health

  • Colic and Laminitis: These are two big concerns. Colic, a digestive upset, can happen if a horse eats too much of anything, not just watermelon. Laminitis, a painful hoof condition, can flare up if a horse’s diet has too much sugar. It’s all about balance.
  • HYPP and Insulin Resistance: Some horses have special dietary needs. HYPP, a genetic condition, means they need low potassium foods. Watermelon’s okay in small amounts, but not in big servings. For horses with insulin resistance, watching the sugar intake is crucial, making watermelon something to give sparingly.

Special Considerations for Different Horse Populations

Senior Horses: Older horses might have more dietary sensitivities or health issues like dental problems or a slower metabolism. While watermelon can be a hydrating treat, it’s essential to match the portion to their overall diet and health status.

Horses with HYPP or Insulin Resistance: For these horses, every bit of food counts. Watermelon has potassium and sugars, so it’s best to consult with a vet to figure out if it fits into their diet.


How much watermelon can a horse eat?

A horse can safely enjoy a few small chunks or slices of watermelon as a treat. Feed in moderation, making watermelon only a small part of the horse’s overall diet to avoid any health issues. Always remove the seeds to prevent choking, and consider the horse’s size and dietary needs when deciding on the amount.

Do horses like watermelon?

Yes, many horses enjoy eating watermelon. It’s a refreshing and hydrating treat, especially during hot weather. Horses often like both the juicy flesh and the rind of the watermelon. However, like any treat, it should be given in moderation and with consideration to the horse’s overall diet and health.

Can eating too much watermelon make your horse unwell?

Yes, eating too much watermelon can make a horse unwell. While watermelon is safe in moderation, overconsumption can lead to digestive upset, such as colic, or contribute to conditions like laminitis due to its sugar content. It’s important to feed watermelon as a treat, not a staple of the diet, and always in moderation to avoid health issues.

Does watermelon cause colic in horses?

Watermelon itself does not typically cause colic in horses when fed in appropriate, moderate amounts. However, overfeeding any treat, including watermelon, can lead to digestive upset or colic, especially if the horse is not used to the treat. It’s important to introduce any new food slowly into their diet and keep treats to a minimal portion of their overall intake to prevent colic.

Is it okay to feed watermelon to a horse I don’t own?

No, it’s not advisable to feed watermelon or any treat to a horse you don’t own without the owner’s explicit permission. Different horses have unique dietary needs and restrictions, and what seems like a harmless treat could inadvertently cause health issues. Always ask for and respect the owner’s guidance when it comes to feeding their animals.

Which horses should not eat watermelon?

Horses with hyperkalemic periodic paralysis (HYPP) or insulin resistance should not eat watermelon. HYPP-affected horses can have episodes triggered by potassium, which watermelon contains. For horses with insulin resistance, watermelon’s sugar content poses a risk, as it can exacerbate their condition. Therefore, it’s best to avoid feeding watermelon to these horses to maintain their health.

Proceed with Moderation 

When it comes to giving your horse watermelon, think “less is more.” A little bit here and there makes for a perfect treat, especially when it’s hot out. But, watch out for giving them too much. 

Too many sweets can upset their stomach, and big chunks can be a choking hazard. Just cut the watermelon into small, easy-to-bite pieces.

This way, your horse can enjoy a slice of summer, just like we do, without any trouble. Remember, the secret is to keep it simple and not overdo it.

Picture of Dr. Noman Tariq

Dr. Noman Tariq

Dr. Noman Tariq, a seasoned veterinarian with a DVM from ARID University and an MPhil in Animal Nutrition from UVAS, specializes in equine health. His deep passion for horse nutrition and well-being drives his work, offering invaluable advice for horse owners. Dr. Tariq's expertise ensures horses lead vibrant, healthy lives.
You can read my full bio here

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Can Horses Have Watermelon? Dos and Don’ts