How did people first protect their homes?, Farm animals, dogs, and even geese did the job!, They make noise when they hear things., Dogs were kept as pets thousands of years ago for this reason., Dogs have good hearing., They have a strong sense of smell., Food can take their attention., They need to be trained., Today, they still protect the home., This is called an animal-based security system., There were also non-animal based security systems., A man named Tildesley made the first door alarm.

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