Avocado contains a toxin called persin. Dogs and cats are rarely affected by persin, however, persin poisoning is deadly to birds and large animals (such as cows, goats, sheep). Pancreatitis can occur, due to the high fat content of avocados. The major risk to dogs and cats is in the ingestion of the large seed. It can create obstruction in the esophagus, stomach, or intestinal tract if part or all of a large avocado seed is swallowed.

Pet birds, including canaries, parakeets, cockatiels, and large parrots, should never be fed avocado as they are extremely susceptible to persin. Signs of poisoning in birds include inability to perch, difficulty breathing, fluid accumulation around the bird’s heart and lungs, liver and kidney failure, and sudden death.

Ruminants and horses can also develop toxicity if they ingest enough avocados or avocado plant leaves. Ingestion can result in mastitis (inflammation of the mammary glands), swelling of the mouth, head, neck, or chest, and damage to the heart with potential for death.

Websites

https://www.petpoisonhelpline.com/poison/avocado/

https://www.aspca.org/news/scoop-avocado-and-your-pets

https://www.animalhealingcenter.net/blog/avacado-toxicity.html

https://www.petmd.com/dog/nutrition/are-avocados-poisonous-dogs

https://www.merckvetmanual.com/toxicology/food-hazards/avocado-toxicosis-in-animals

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Disclaimer –  The content of this page is not veterinary advice. A number of factors (amount of substance ingested, size of the animal, allergies, etc.) determine what is toxic to a particular pet. If you think your pet has eaten something potentially toxic, call Pet Poison Helpline or seek immediate veterinary treatment.