Oddly, this discussion comes up now. I saw a deer this morning on my neighbor's property close to our joint vegetable garden. Big white tail doe. I was walking my 10 pound Pomeranian to check the garden. I didn't want her to see the deer because she would have gone right after her.
Living in the mountains we have a huge problem with deer. Hosta is like butter to the deer. What I do know is that deer don't like walking on gravel or a stone walkway. It hurts there hooves, and they avoid it like the plague. I have a gravel pathway on one side of my daylily beds. That helps. My dog will bark at anything that comes on the property at any time day and night. That includes 3 am in the morning. This also helps.