Conker warning issued for dog owners this autumn

Wednesday, 10 September 2025 15:04

Dog owners are being urged to take care on autumn walks as conkers and acorns can be harmful, and in some cases deadly, to pets.

The Dogs Trust has warned that eating or chewing the seeds can make dogs unwell within hours, with symptoms including vomiting, diarrhoea, stomach pain and swelling around the eyes and mouth.

Conkers, which fall from horse chestnut trees, contain a toxin called aesculin. As well as causing illness, they also pose a choking hazard and can cause blockages in the gut.

Victoria Phillips, Veterinary Surgeon Manager at Dogs Trust, said: “Conkers might be a sign that autumn is here, but it is vital that dog owners understand that conkers and acorns can be toxic to dogs and, in some cases, can even be deadly.

“Bigger dogs might swallow them, and smaller pooches might give them a chew, both of which can have some nasty side effects!”

Owners are advised to keep dogs on a lead in conker-heavy areas and to seek immediate veterinary advice if they believe their dog has eaten conkers or acorns.

Ms Phillips added: “They may look relatively harmless, but they can cause serious issues.”

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