This is specifically for when he isn't home as mentioned in first sentence of the article.

> I set up a fake dog that barks if my surveillance cameras are triggered while I'm out of town on vacation.

Also owning a gun actually increases your chances of homicide at home.

https://time.com/6183881/gun-ownership-risks-at-home/

https://www.hsph.harvard.edu/news/hsph-in-the-news/do-guns-m...