Yes, it is is okay to trim away any dead branches that are the result of the deer damage. But arborvitaes do have the ability to produce new buds and it might be best to wait until early summer to see if anything will grow on the lower branches. If not, you can prune your arborvitae to remove those bare branches. Moving forward, you might want to consider putting up a deterrent (i.e. fencing) around the bottom of your trees to prevent any further damage in the future.
Yes, it is is okay to trim away any dead branches that are the result of the deer damage. But arborvitaes do have the ability to produce new buds and it might be best to wait until early summer to see if anything will grow on the lower branches. If not, you can prune your arborvitae to remove those bare branches. Moving forward, you might want to consider putting up a deterrent (i.e. fencing) around the bottom of your trees to prevent any further damage in the future.