Pet Talk: Avoid mushroom poisoning in pets Posted in: Opinions COLLEGE STATION – Although commonly underestimated, mushroom intoxication ranks near the top of the list of pet poisonings each year. Of these deadly fungi, Death Cap mushrooms are the number one cause of fatal mushroom poisoning worldwide. Death Cap mushrooms are an invasive species that favor oak and pine trees. While ...PLEASE LOG IN FOR PREMIUM CONTENT. Our website requires visitors to log in to view the best local news. Not yet a subscriber? Subscribe today!