Spot is our farm dog and the alpacas are his herd to guard.
Spot usually does a great job of knowing what is a threat and what isn't. Our kittens are not a threat in his book:
Most of the time he completely ignores them:
But it does seem like fireworks are a huge threat to his herd, he barks every time he hears one. Since they are similar to the sound of a gun shot, I can't blame it. But it sure does make holiday time interesting when he barks at every single one.