outdoor
Acorns
IMMEDIATE VET ATTENTION
Acorns and oak leaves are toxic to dogs. They damage the kidneys and can cause gut obstruction.
If your dog has eaten this item, contact your vet or an emergency veterinary service now.
If your dog is showing symptoms such as difficulty breathing, seizures, collapse, severe vomiting, unconsciousness or other serious symptoms, seek emergency veterinary care immediately.
What to do
Contact your vet immediately, especially if your dog ate several acorns or is showing symptoms.
When to contact a vet: Emergency vet attention if your dog ate a large number, is vomiting repeatedly, or seems lethargic.
Symptoms to look for
- vomiting
- diarrhoea
- lethargy
- abdominal pain
- loss of appetite
- excessive thirst
- bloody stools
- weakness
Why
Acorns contain tannins that can damage the kidneys and liver. Dogs that eat large amounts, or repeatedly eat acorns or oak leaves, can develop kidney failure. Whole acorns can also cause a blockage in the gut. Green acorns are more toxic than mature ones.
- Substances of concern
- tannins, gallic acid
- Safer parts
- {}
- Parts to avoid
- {acorns,"oak leaves","oak twigs"}
- Preparation
- No safe preparation. Keep dogs away from oak trees in autumn.
- How much matters
- Toxicity depends on the number eaten and the dog's size. Even a few can cause vomiting.
- Severity
- Severe
Sources
- ASPCA Animal Poison ControlPrimary authoritative — Plant toxicity
- Veterinary Poisons Information ServicePrimary authoritative — Plant toxicity
Information reviewed against recognised veterinary and animal-safety sources. Source organisations are independent of Is It For Dogs unless otherwise stated.
Last reviewed 6 September 2026 · next review due September 2027.
Safety classifications are based on available expert and veterinary information. Individual dogs may react differently, particularly dogs with allergies, existing health conditions or specific dietary requirements.
Important: Is It For Dogs provides general information about the safety of foods, plants, drinks, ingredients and other items around dogs. Our information is based on sources we consider reliable and is intended to help dog owners make informed decisions. It is not a substitute for advice from a qualified veterinary professional. Read more
Dogs can react differently depending on their size, age, health, allergies, medications, the amount consumed and other circumstances. An item classified as Safe is not necessarily suitable for every individual dog.
If your dog has eaten something potentially poisonous or dangerous, has eaten an unknown substance, or is showing concerning symptoms, contact your veterinarian or an emergency veterinary service immediately.
Do not induce vomiting or give your dog medication unless specifically instructed to do so by a veterinary professional.