This will not hurt the deer. The deer will shy away from the scent of other animals, so you trick them with the bloodmeal and hair clippings. Your barber is a good source for some hair sweepings.

1 yard old sheeting, cotton, or muslin
1/4 C. bloodmeal
1 C. hair clippings

Cut the fabric into small 4-inch squares. Mix the bloodmeal & hair together & place about a tablespoon onto the center of each square. Bring up the ends and secure with a string or rubber band.
To use, hang these little packets from the branches of the trees & shrubs where deer are a problem. You should be able to notice deer avoiding the spot almost immediately