[Vivianne]

You're not alone. Last night Madison barked at my truck because I didn't put it in it's usual spot. We were on a potty break when we rounded the corner of the house and she spotted the truck. Short little barks and a lot of huffing, puffing and snorting at first.
It was pitch black out and perhaps the silhouette of the vehicle spooked her.
You'd be surprised at just what they can hear, smell and see that we can't. Madison has barked from inside the house to answer other dogs blocks away. I did not hear them until I went to check out what she may be barking at. After a few minutes of hanging on the door, I heard faint dog barks in the distance.
Always check out what's alarming Mia, it doesn't do any harm. If she's just barking at the wind, correct her, tell her no. If it turns out something's in the yard, praise, praise, and more praise.