Get

In Your Inbox

Dogster is reader-supported. When you buy via links on our site, we may earn an affiliate commission at no cost to you. Learn more.

Are Conkers Poisonous to Dogs? Vet-Verified Facts & FAQ

conkers on leaves

If your dog eats a conker, you may be concerned about their health. Those concerns are justified because conkers (a type of nut from the horse chestnut tree) are poisonous to dogs if they are chewed and swallowed.1 What’s more, conkers are the perfect size to get caught in a dog’s throat or even block their intestines. It is recommended to reach out to your vet for further instructions. Let’s take an in-depth look at why dogs shouldn’t eat conkers.

divider single dog paw oct 2024

What Are Conkers?

Conkers, also known as horse chestnuts, are the large, shiny, dark brown seeds of the Aesculus trees native to Europe. These easily recognizable and widely available “treasures” can be found every autumn in parks, gardens, and forests throughout Western Europe as far North as Scotland.

While to humans, they may seem like nothing more than overgrown marbles, to mischievous dogs, these treasures could be deadly.

conkers or horse chestnuts
Image Credit: Elsemargriet, Pixabay

Are Conkers Poisonous to Dogs?

Conkers are poisonous to dogs if they are chewed and swallowed. So, if your dog just puts one in their mouth and spits it out, it’s likely not cause for concern. However, if your dog actually ingests one, it could spell trouble. Conkers contain a compound called aesculin, a glycosidic saponin,2 the toxin that can make dogs sick. They also contain other cytotoxic saponins.

What Happens if a Dog Eats a Conker?

The good news is that conkers have a bit of a bitter taste to them, so your dog may spit it out before consuming it. This is the best-case scenario, and your dog will likely be fine. However, actually ingesting a conker can lead to stomach upset in dogs and more serious side effects. If your dog is on the smaller side or eats more than one conker, the effects can be more serious, so it’s recommended to reach out to your vet in any case, especially if you don’t know how much your dog ate.

Signs can take anywhere from one to 24 hours or more to become apparent. It is important to contact your veterinarian rather than wait for signs. Treatment will be more favorable if started sooner.

In severe toxicity cases, additional signs such as dilated pupils, depression, excitement, seizure activity, and even coma followed by death.

Even if the dog isn’t affected by the aesculin in conkers, the hard shell of the nut can cause digestive upset or even choke on them if swallowed whole. What’s more, the nut can get lodged in your dog’s digestive tract, leading to more serious health complications. If a dog does manage to ingest one, it is important that they are monitored for any signs of distress like vomiting or diarrhea. If these occur, then the dog should be taken to the vet as soon as possible to ensure that no further damage is done and treatment can begin. In some cases, surgery may be necessary if the conker has become caught in the digestive tract.

If you need to speak with a vet but can't get to one, head over to PangoVet. It's an online service where you can talk to a vet online and get the personalized advice you need for your pet — all at an affordable price!

PangoVet_Mention-in-Content Savings V1

What Are the Signs That My Dog Needs to See a Vet?

If you suspect that your dog has eaten a conker, it is important to look out for any signs of distress. These may include vomiting, diarrhea, abdominal pain or swelling, lethargy, and loss of appetite. If any of these are seen, then it is best to seek veterinary advice as soon as possible. It is important not to induce vomiting in your dog unless directed by your vet to do so.

Are There Any Home Remedies if a Dog Eats a Conker?

If you think that your dog has eaten a conker, home remedies are not recommended as the best course of action and can actually do more damage. It is important to seek veterinary advice if your dog eats a conker, as they can assess the full extent of the problem and provide appropriate treatments.

How Can I Prevent My Dog From Eating Conkers?

The best way to prevent your dog from eating conkers is by making sure that they are not in reach. This means avoiding areas where conkers can be found and ensuring that any garden activities, such as raking leaves or playing with sticks, do not result in conkers being accessible to your pet. It is also important to monitor your pet when out for walks, especially in the autumn months when these nuts are falling from the trees. In addition, teaching your dog commands such as “leave” and “drop” will help ensure that if they do find a conker, it can easily be taken away before it becomes a health hazard.

a conker on grass
Image Credit: vjkombajn, Pixabay

divider single dog paw oct 2024

In Conclusion

Conkers are poisonous to dogs and the risks will depend on how much was eaten. The hard shell of the nut can also cause your dog to choke on them if swallowed whole. It is important that owners watch their pets closely when conkers are present. So, dogs should not be given free rein to eat them, and you should seek veterinary care if your dog eats one, especially if you notice signs such as vomiting, diarrhea, and visible distress.

See Also: 

Sources
  • https://www.thekennelclub.org.uk/health-and-dog-care/health/health-and-care/a-z-of-health-and-care-issues/conkers/
 

Featured Image Credit: ostadal, Pixabay

How useful was this post?

Click on a star to rate (you can leave written feedback after clicking submit)

Help us improve Dogster for pet parents!

Your feedback really matters.

What did you like about this post? Also how can we improve it?

Join the conversation

Leave a Reply

You’re very welcome to leave a comment or question. Please know that all comments must meet our community guidelines, and your email address will NOT be published. Let’s have a positive and constructive conversation.

Talk With A Vet Online

Peace of mind,
anywhere, anytime

Affordable vet advice

8 Off-Leash Dog Parks Near Reston, VA (2025 Update)

Dogs need socialization. While you may be their best friend, getting to know other people and their dogs is a great way for...

Can Dogs Eat Corn? Vet-Reviewed Facts & Nutritional Benefits

Corn is a ubiquitous ingredient that shows up in all sorts of things, including dog food. This makes many people believe that corn...

150+ Popular & Unique Nova Scotia Duck Tolling Retriever Names

Naming your pup is an important step, and it’s not something that you want to get wrong. You’ll be using this name for...

Continental Bulldog Breed: Info, Pictures, Care & More

The Continental Bulldog is a new breed that was developed in Switzerland in 2005. The Continental Bulldog is so named because it is...

More related

Sable Cockapoo: Info, Pictures, Origin & History

Cockapoos, the perfect mixture of a poodle and a cocker spaniel, are known for their affectionate personalities and adorable features. They have various...

Can Dogs Eat Pita Chips? Vet-Reviewed Nutrition Facts & FAQ

Made with flour, water, yeast, and salt, pita is a simple snack originally by the Middle East and Mediterranean cultures that easily assimilates...

L-Carnitine for Dogs: Benefits, Uses & Side Effects (Vet-Reviewed)

There are a ton of supplements available for dogs nowadays, and as we naturally all want the best for our pets and want...

What Is Japanese Style Dog Grooming? Canine Hairstyle Facts & FAQ

With Japanese-style dog grooming, the goal is to make dogs look stunningly cute, so traditional ideas about haircuts and trims are thrown out...

Keep reading

Can Dogs Eat Ginger? Vet-Verified Benefits, Risks & FAQ

Ginger has long been used for everything from cooking and flavoring to being added to medicines. The benefits of ginger have been documented and proven effective for humans, but what about dogs? Ginger is also considered beneficial for dogs and...

Can Dogs Eat Ginger

Can Dogs Eat Rambutan? Vet-Verified Safety Facts

If your dog is like most, they love to eat. They gobble up their food at every mealtime, go after scraps that fall off the table or counter, and investigate anything that they come across outdoors to see if it...

Can Dogs Eat_rambutan

What Are Tocopherols in Dog Food? Vet-Verified Nutritional Facts

Commercial dog food is what most owners feed their dogs because it’s convenient, and affordable compared to homemade food, and typically offers all the nutrients that a dog needs to thrive and enjoy a high quality of life. Many different...

dog eating dog food

Nature’s Logic Dog Food Review 2025: Pros, Cons, Recalls, and FAQ

Review Summary Nature’s Logic was founded in 2006 by Scott Freeman. Freeman conjured up dog food that uses 100% natural ingredients without using cheap, synthetic vitamins. In 2005, the first batches of dry dog and cat food were sent to...

Dogster_Nature’s Logic Dog Food Review

Can Dogs Eat Fritos? Vet-Reviewed Facts & FAQ

Dogs aren’t well-known for their pickiness, and it’s up to owners to monitor the food they can access. Just as you wouldn’t eat a bowl of Purina, your pup shouldn’t be making a habit of feasting on the foods we...

Can Dogs Eat_fritos

10 Best Dog Foods for Labradoodles in 2025 — Reviews & Top Picks

Whether you have just brought a Labradoodle into your home or are a long-time owner, you want the best for your pet. Providing complete nutrition is part of keeping your dog active and healthy. As large dogs, Labradoodles have different...

labradoodle lying on bench

Can a Puppy Eat Adult Dog Food? Vet Approved Facts & FAQ

Bringing a new puppy home is an exciting experience. Plenty of responsibilities are involved, like ensuring your new pup gets the proper nutrition for a long, happy, and healthy life. But what exactly should you be feeding your puppy? Is...

Can a Puppy Eat Adult Dog Food

Relievet CBD Dog Treats Review 2025: Our Expert’s Opinion

What Are Relievet CBD Dog Treats? How Do They Work? Hemp, or the marijuana plant, has been used since before recorded human history began for many purposes. These purposes include religious use, recreational use, pain control, mood stability, and other...

Relievet CBD Dog Treats