LOL...I can relate.
We have the Corgi [with ears like a bat] security system...that dog has hearing like no dog we've ever had before and she let's us know it.
Our big Ratty about 20 pounds comes from Beagle mix. The Toy Ratty comes from a Chihuahua mix and neither one is scared when it comes to alerting us or taking on a Booger LOL. The small one also is my wife's companion and we've taught her to be her service dog as well. If my wife needs me and I don't hear her the Toy barks till I check on her. If I'm asleep and she needs me, my cell phone rings, or gets a text, she comes in and jumps on my chest LOL. I can tell by their reaction when my outside motion sensor goes off as to if it's a car coming up the driveway or not.