Do you live in a rough neighborhood? Instead of getting a dog for you backyard have a look at this Paintball Sentry Gun. When you go out for the day just turn it on and you will be totally protected. When you return you will probably have to escort a few kids out from behind your tree where they took cover but that is a small price to pay for piece of mind. 
There isn’t much detail on the operation but it seems like a camera looks for movement and fires at it. I am amazed at how fast it can move and how accurate it fires!
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