I used on four does that walked a trail behind some trees near me two weeks ago, they didn't bat an eye. Didn't run, but didn't acknowledge it either. Last week I used it on a doe I saw walking about 80yds away, she stopped dead and started looking for another deer. When she didn't see anything she just walked away. Didn't bring anything in, but it didn't appear to scare anything either.

Then again, I pretty much don't have a clue what I'm doing anyway so everything is a learning experience.