The Best What Is Something Cows Eat That's Poisonous To Them Ideas. Poisonous does not mean deadly. Caffeine causes cardiac malfunctions in birds and is associated with increased heartbeat, arrhythmia, hyperactivity, and cardiac arrest.

Mountain laurel, along with the closely related azalea and rhododendron, is toxic to sheep. The dose, as always, determines if a plant is safe source of nutrients or a toxic hazard. In australia we feed cattle orange peel left.