The deer have been such a problem. I know they won't eat the grasses, but they love the arborvitae.
We have holly, too, but only two, and I cut them back when they get in my way. My husband would never prune anything, if it were left to him, and the lugustrum would be blocking the windows up to the second floor!
We get deer in the subdivision, since we have woods and fields, but not at our house.