While that may be true for deer that have little to no human or dog encounters but where I live in a suburban/rural area deer don't seem the least bit fazed by either. There is a bush in my driveway that was my dogs first stop every day but it was also a favorite with the local deer herd as well. As for myself I find it quicker to do my thing outside than drag chicken poop or mud into the house so wherever I was there you go. I would go with deer fencing if you really wanted to protect your plants. I had a friend buy these electronic deer repeller. It actually attracts the deer and then zaps it. Work for a while but they ate the arborvitaes he was trying to protect and ignored the zappers.