Clover is much like alfalfa. It is too fattening and high in calcium. I buy my hay from a farm and garden store. I always ask for grass hay, but sometimes it comes with clover or alfalfa mixed in. Clover seems to cause less of a problem for my rabbits than alfalfa. A little bit won't hurt. I pick out the alfalfa or clover if there is a lot of it. It has a different feel to it, so it is easy to pick out. The leaves of the plants crumble easily. I put my hay in a metal trash can, and when I get to the bottom, I find the leaves of the plants and I just toss them out.