I am debating about lining our backyard with hazelnut shells as it looks nice and can protect plants pretty well. The only thing I worry about it that I have read online that the shells may be sharp and cats don't like stepping of them (which is a plus for us because we have an issue with all of the neighborhood cats using our backyard as their litter box). The only issue is that if it hurts cats, how are chicken feet with hazelnut shells? If it is only uncomfortable for the chickens and keeps them away from scratching up the dirt around the plants, we are okay with that as their feet are a bit stronger than cat feet-pads. But if they actually hurt/cut the chicken feet, we won't want to get it. Does anyone have experience with this?