A slice of onion that disappears from a kitchen counter can be a minor joke for a human, but it is a toxic event for a cat. Members of the Allium family, including onion and scallion, carry sulfur‑containing compounds that turn into a biochemical weapon in feline blood.When a cat eats onion, thiosulfates and related oxidants damage hemoglobin inside red blood cells. The result is oxidative stress ...More