I'm sure you've probably seen some naughty deer, too, right in your own neighborhood? So how can I protect my arborvitae from those pesky little creatures?
You can buy chemical deterrents or synthetic coyote urine to keep the deer away. I've had better luck with the second option.
You can use a physical barrier to protect your beautiful tree. All you need is something like netting, burlap, or screen, which you can wrap around the tree from top to bottom. I suggest taking it down in the spring so your plant can still get some fresh air.