You're supposed to compost any shit before using it as fertilizer. Appling poop directly to a plant is never really a good idea unless you water it down a lot.
Interesting. The grass around the cat shit in my garden always seems to grow much better than the surrounding grass. I'm assuming the cats also eat a carnivorous diet.
It all depends on the plant. Some plants, including grasses, take direct shit great. Others, not so much. It has less to do with the type of shit and more with the type of plant. Most shit is composted before use.