Q: We have a fenced back yard and have never had any problems with critters. This year we put down zoysia sod and something is digging it up.
A: I’d lay my money on raccoons. They have dexterous paws that are ideally suited for pulling up sod to look for earthworms and grubs. Consider securing the sod to keep it from being rolled up again. This is easy to do using chicken wire. Lay wire over the sod and anchor it down with “hairpins” made from wire clothes hangers. Be generous with the anchors: one every six inches along the edge of the chicken wire.