Ok guys i'm stepping in and getting serious here. I've worked in animal medicine for a long LONG time and I'm telling you that animals (yes that includes cats) CAN die from THC toxicity. Too much THC cause bradycardia (low heart rate)that can actually get too slow to sustain life. We usually treat with a drug that increases heart rate so eating mj is not something you guys should be alllowing. How much is too much? That would depend on how much actual THC they are eating---and they shouldn't be eating ANY!
Soapbox over.

Peace to all who reside here...