Courtesy of Kennel Club Newsletter www.thekennelclub.org.uk
On crisp autumn walks your dog may come across conkers that have fallen from a horse chestnut tree, but are these shiny seeds poisonous or harmful to dogs, what happens if your dog eats one and when should you contact your vet for advice?
A conker is a shiny, round, red-brown seed from a horse chestnut tree (Aesculus hippocastanum). These trees are usually seen in parks, gardens and along the side of streets in the UK. Conkers are often found on the ground in autumn after dropping from the tree encased in a green or brown spiky fruit.
Yes. Conkers contain a toxin called aesculin, which can cause a dog to be sick or may upset their stomach. If enough is eaten it can also produce more serious effects, and in rare cases can be deadly.
Conkers taste quite bitter, so it’s unlikely that most dogs will eat enough to make them very ill. Eating small amounts may give your dog an upset stomach, but larger amounts could make your dog quite unwell. Very serious effects can occur, but they are rare.
The amount of toxin in each conker is different, so it’s impossible to know the amount of conkers that your dog would need to eat to make them unwell. A conker’s toxicity will vary from tree to tree and year to year and is dependent on a number of different factors. How your dog is affected by this toxin will also depend on their size, how much they’ve eaten, when they last ate, how much they chew up the conker and if they have any other health issues.
After eating a conker, your dog may start to become unwell between one and six hours later. In rare circumstances these effects can be delayed by a few days.
Symptoms include:
Poisoning is not the only risk from these seeds. Conkers are large and hard and could cause your dog to choke on them or could block their stomach or gut.
All parts of the horse chestnut tree are poisonous and could make your dog ill. The toxin is found in the seeds (conkers), leaves, bark and flowers.
If your dog is prone to eating conkers, then keep them on a lead when going for autumn walks (especially in areas where you know there are conker trees). When walking near ‘conker trees’, bring along a ball or a chew toy to help keep their mouths occupied.
If your dog has eaten conkers, then you should contact your vet for advice. If you’re unsure whether your dog has eaten them, but they’re showing some of the common signs, then you should speak to your vet. Never try to make your dog sick as this can be dangerous and may cause other problems.
Quote for the season:
“Dogs’ lives are too short. Their only fault, really.”—Agnes Turnbull
Copyright © 2025 The Dog Lady Wales - All Rights Reserved.
Powered by Paws