Somthing spooked the boys

But then again, anything and everything spooks Fred. And if Fred starts barking, Bob rallies to defend him, so then he starts barking. You'd think that we were being attacked by evil squirrels. There is something in Fred's DNA that tells him to go after every squirrel. A squirrel can be right next to Bob and nothing happens. Bob's job is to defend the yard against those devious robins.