15/10/2025
At this time of year, we receive lots of enquiries regarding acorns and oak trees (Quercus species). We have seen an influx in calls this year as 2025 has been declared as a Mast Year. This is when some trees produce a large amount of fruit, seeds and nuts, and happens every few years.
Ingestion of acorns by dogs is common during the autumn months. Following a large, one off ingestion of acorns, vomiting and diarrhoea may occur in dogs, both of which may be bloody. Lethargy, abdominal tenderness and inappetence can also be seen and there is also the risk of gastrointestinal obstruction. There have been reports of kidney and liver damage following substantial or repeat ingestion of both acorns and the plant itself, a scenario more commonly seen in horses and ruminants.
Oak toxicity predominantly affects grazing species such as cattle, horses and sheep, but it can affect dogs and cats too.
📞If you suspect your pet has been exposed to oak, call the Animal PoisonLine on 01202 509000 for advice. Veterinary professionals can call VPIS on 020 7305 5055.
