A friend of mine is a dog handler for the ATF in Missouri. They have tried everything you can imagine under the sun to try and mask scents to confuse the dogs to include the Ozone gimmick.

They have yet to find anything that can trick those dogs.

That tells me that a deer can smell it too under the right circumstances.

If you want one buy one but I wouldn't bet the bank a deer won't smell you if they are downwind.