So the last couple of days have been trying to say the least. My mastiff Hancock has been low growling while looking down my hallway. Only my boyfriend, we’ve had Hancock since he was a puppy, is in the bedroom down the hall. So I thought nothing of it. Now last night we were standing in our bedroom and Hancock wouldn’t come in. He sat outside our door looking at us. Then he started aggressively barking at the door all the while backing up as if something were moving towards him. He was clearly upset. It terrified me. This is a 145 lb dog..afraid of air? I don’t know what to think.