My dog was exhibiting some strange behavior tonight, and I have no clue why or what happened. She's always been very attached to her bed and she's always laying inside it. Tonight was no different. She was laying on her bed pretty much all day. I sat down next to her on the couch and was watching T.V. for at least and hour. Then all of a sudden she got up and started barking at it. She then seemed to be very afraid of it. She was walking around it and sniffing it from afar but did not want to go on top of it. I examined it and nothing was there. It's a small white cushion. I didn't see anything, no bugs, no fleas, etc. It would be very easy to spot if there were. I tried to carry her onto it, but she jumped off right away and wouldn't go near it. For the rest of the night, she would not go back on it. She eventually fell asleep somewhere else far away from her bed. Any clue what this behavior was? Any cause for concern?