TL;DR: Acorns can cause toxic reactions like kidney damage and physical obstructions in dogs; contact a veterinarian immediately if your dog eats a large quantity or shows signs of distress.
What happens to my dog’s health if they eat acorns?
- Acorns contain gallotannins that break down into tannic acid, which can cause gastrointestinal irritation and, in severe cases, liver or kidney damage.
- The hard shells are difficult to digest and pose a high risk for choking or intestinal blockages, especially in smaller breeds.
When should I treat acorn ingestion as a medical emergency?
- The urgency level is medium; while a single acorn may cause mild upset, eating a large volume is a serious concern that requires contacting a vet or poison control.
- Immediate intervention is required if your dog exhibits frequent vomiting, bloody diarrhea, or extreme lethargy.
- Seek help if your dog shows signs of abdominal pain, such as guarding their stomach or stretching uncomfortably.
How can taking a photo of the acorns help the vet during triage?
- A clear photo of the acorns or the tree helps the veterinary team identify the oak species and its tannin concentration.
- Showing the size and shape of the acorns helps the vet assess the likelihood of a physical obstruction in the digestive tract.
- If your dog vomits, a photo of the contents can help the vet estimate how much was ingested and how much was expelled.
Clinical Context (Merck Veterinary Manual)
Consumption of large quantities of green acorns can cause toxicosis in dogs, with clinical signs typically appearing 3-7 days after ingestion. The toxic principle, potentially pyrogallol, gallotannins, or polyhydroxyphenolic compounds, binds and precipitates proteins, leading to gastrointestinal and renal dysfunction. Clinical signs include anorexia, depression, vomiting, ataxia, tremors, hyperthermia, and potential renal insufficiency characterized by increased BUN and creatinine, proteinuria, glucosuria, hyperbilirubinuria, hyperphosphatemia, hypocalcemia, and urine with low specific gravity. Diagnosis is based on history of exposure and clinical signs; differential diagnoses include ethylene glycol toxicosis, ingestion of hypotensive agents, and infectious diseases.
Chapter: Toxicology
Source: The Merck Veterinary Manual, 11th Edition (Page 3152)