Some security companies have taken this into account by creating motion-activated barking dog alarms. When a person approaches your door, it will activate a bark that will get louder the closer a person approaches. These alarms cost much less than a full-scale alarm system and are simple to set up.
The brand I like (which is available at Amazon.com):
Rex Plus is created by Safety Technology International. It costs roughly $85.95 USD at Amazon but one can find it at other places online too.
What do you think about these alarms, brilliant invention or lame gimmick?
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