are rhododendrons poisonous to sheep?
The toxic dose is 0.2% body weight of green leaves, which equates to about 2 pounds for a 1,000 pound horse or cow, 0.3 pounds for a 150 pound sheep or goat, and less than a quarter ounce for a 5 pound chicken. Rhododendron is also toxic to dogs and cats although they are less likely to consume it than livestock.