I have had many of cat accidents with my plants. For some reason they like laying on the plug trays. I have seen 2 of my cats eat them as well. So far no ill effects. Its depressing, but it does happen around here. I am not certain, but I think they go for the ones I dont have additional seeds of
One of my cats, shortly after I yelled at him for eating a tomato seedling, grabbed a hold of a cactus I had transplanted from one of those cactus gardens people give as gifts, and was running around the house with it. I managed to save the cactus but nary a cut on the cat.