Answer: Dog urine can certainly burn the foliage of your arborvitae, so if you suspect the plant is frequented by your dog, that's probably the cause of the dead foliage. Diseases can cause similar symptoms but diseases do not usually remain on the bottom 2-feet of foliage. Cut back the dead plant parts - new growth may appear from the trunk. If you can't train your dog to stay away from the arborvitae, try placing a temporary fence around the plant. Perhaps your dog will get out of the habit of urinating on the arborvitae when he finds he can't approach it!
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