Excerpt courtesy of theHorse
One California horse is dead and another recovering after being poisoned by cookies laced with oleander.
Oleander (Nerium oleander) is a leafy, flowering, drought-resistant plant used in ornamental landscaping in several parts of the United States, including California, Utah, Arizona, and Texas. It contains cardiac glycosides that can cause various clinical signs of toxicity in horses, including colic, lack of coordination, profuse sweating, difficulty breathing, abnormal heart function, muscle tremors, and potentially death from cardiac failure. As little as one ounce can be fatal to some horses.
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