Avocado - dog's greatest enemy

According to the Merck Veterinary Manual, feeding avocados to your pets or any other animal should be avoided at all costs. Animals such as cattle, horses, goats, rabbits, birds, dogs, cats, and even fish can be severely harmed or even killed if they consume the leaves, bark or fruit of the avocado tree.

http://www.avocado.com/site/fun-facts/avo-info/avocado-toxicity-in-animals-and-pets