Poison Ivy is anananancient cure for Stupid Cat Syndrome.
How it was Discovered
It gave First Ruby Cat a stomach ache after being stupid and overeating (Stupid Cat Syndrome). Old McDonald's ancestor found the three leaved plant and used it on all other cats with the disease. It made them feel sick, but it also made them better. It was one reason why the Stupid Cat Revolution ended because it's "goodyummy". This also lead to cats having poisonous/green eyes, or "Petey-Type" cats.