Potty training - each time you take your new puppy out to pee ring a bell you've hung on the door knob with his paw, and eventually he will start ringing the bell on his own to let you know he needs to go out.
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Dogs will avoid anything rubbed with Bitter Apple Spray, which you can buy at the pet store. As for cats, they instinctively avoid citrus, so if you use a citrus-scented cleaner they’ll likely stay off that surface.