"Private"
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Question: Did you wear gloves when handling the antler that you hid? If not, your dog may be keying in on your scent rather than the antler. I was on the beach a couple weeks ago and found a cool rock that I wanted. I set it up on a larger rock about three feet off the ground and continued my walk with our dog. On the way back, over a half hour later, she was walking past the boulder, when she got downwind, she instantly turned and went straight to the rock I had picked up.
I look forward to seeing this video when we can.