Reminds me of our dog when he was a couple of years old. He was in the kitchen barking up a storm, and it wasn’t until I put my head down near his to see what he was bothered by. It was a box of treats on the kitchen counter – with a picture of a dog on it.
I showed him the box and he never barked at it again; and yes, I rewarded him for protecting us from the two-dimensional intruder.
BTW, cheese-flavored dog biscuits do not taste like cheese.
[Found in here.]