Lately, my cats have been eating my Guinea Pigs's hay. They have always done it a bit but have never actually ate it, they had always chewed it and played with it but now they are actually chewing it and swallowing it. Can it hurt them, is it unhealthy? Should I stop them, if so how, they spend about 80% of there time in my room and about 50% of the time they are in my room, they are in the Guinea Pigs cage with them or playing with there hay (ya, they are wierd but they are best friends with the piggys) If I had too I could somehow make it so the cats cant get into their cage but the pigs and cats would both hate it. It doesnt seem to make them sick by eating it...could it though?