My dog has brain damage

 I am convinced my dog, Sadie, has brain damage.

Last night, I was eating with a friend outside, when all of a sudden Sadie is facing a  low lying brick planter wall with her hackles raised, growling.  My generally sweet tempered dog was clearly incensed.  The growling continued and escalated, her ears and tails were down as she pawed at the ground, and then started barking.  As we tried to control our laughter at my dogs stalking of a wall, I went over to asses the danger.  She became frantic that her foe would hurt me.  Turns out the "foe" was a small FEATHER.  Yep, my brain damaged dog thought I was going to be attacked by a feather.

I certainly sleep better at night knowing what a  good guard dog lives in my house.

Who me, I didn't do anything.