My brother has a bit of a problem with deer, I'm not sure what type of deer they are. He says that the sound of dogs puts them off and they don't like movement. He has some old fertilizer sacks hung in various places around the garden, they flap and make a crackling noise if the breeze catches them. He can unhook them and put them away if he wants to enjoy the garden. He uses old Cd's hung up to scare birds (the moving reflected light bothers them) and he thinks that these deter the deer too.