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The advantage of an electronic alarm is it doesn't get tripped by animals outside.
I had a German Shepherd that hated cats, so at least twice a week she was barking and snarling at the window in the middle of the night at stray cats going by. She had a different bark for racoons and opposums. She developed a completely different response to skunks after she got sprayed - she'd just look out the window and give a low growl, and we knew it was a skunk. She was willing to growl at them but she didn't want to mess with them after getting sprayed once.
The thing about a zoned electronic system, if it's set up properly it will show you which parts of your house are still secure.
But having said that, I'm still leaning toward getting a dog, especially a bigger one that can be effective in doing more than just alerting.
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