If you have a shed or outbuilding with a padlock, keep it from freezing in cold weather by putting a piece of duct tape over the keyhole, then covering the padlock with a plastic bag. This is especially important if you store the snowblower, shovels, etc in the shed! We found this out the hard way this winter.
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I keep hand sanitizer 80% alcohol by my door spray the clasp and my dog is good to go, it's a quick fix cause they gotta go!