Most of the nuts found in the supermarket isle have potential to adversely affect our pets. They are all high in fats which can result in vomiting, diarrhoea, weight gain and pancreatitis.
Macadamia nuts can cause symptoms, including weakness, vomiting, walking unsteadily, shaking, high temperatures and depression. It is unknown exactly what toxin macadamia nuts contain that causes this reaction in dogs and symptoms can last for up to 48 hours.
Almonds can be difficult for dogs to digest and may cause an upset tummy.
Walnuts can cause bowel obstructions if swallowed whole or in their shell. Walnuts (especially mouldy ones) are a particular hazard as they carry a toxin that can cause seizures and other neurological symptoms.
Brazil nuts contain a particularly high amount of saturated fats and they also contain lots of selenium which potentially could cause selenium toxicity if ingested in large amounts.
Cashews, peanuts and pistachios are not generally considered toxic to dogs. However, they are high in fat which dogs have a difficult time digesting leading to issues as described above.