One of our vans has a lot of dents in it - my MIL used to drive it, and I think she had a deer magnet in it... most of the dents are from deer running INTO the van instead of the other way around
When I see them on the highway, I usually try to stay a little farther away from them. Even if it was when someone else was borrowing their vehicle or owned it before them, I'd rather be safer by adding a little buffer zone in between us, just in case. Plenty of times it's not the fault of the driver that they received the dents, but... I'd rather be safe then sorry.