active yeast
Active (unbaked) yeast ferments in the warm digestive tract, producing alcohol (causing acute alcohol poisoning) and carbon dioxide (causing extreme GI bloat, potentially fatal gastric dilatation-volvulus). Note: baked brewer's yeast powder is generally safe — this warning applies only to active unbaked yeast.
Other common names: active dry yeast, live yeast, baker's yeast, yeast dough, fresh yeast, 活性酵母, 生酵母, 酵母菌, イースト菌, 生イースト
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Sources: ASPCA Animal Poison Control Center, FDA Center for Veterinary Medicine, veterinary literature. For reference only, not medical advice. If poisoning is suspected, seek veterinary care immediately.