Why it's dangerous
Pecans, walnuts, almonds, pistachios, and most other non-macadamia nuts are not acute toxins, but can cause digestive upset or pancreatitis because of their fat content.
Toxic compound: High fat content
Sources
This page is informational and is not veterinary advice. If your pet has been exposed to something risky, contact your vet or an animal poison control line right away.