My dog Bentley(4 months old) has been dry hacking/coughing at night and it seems like he's trying to get something out of his throat or somethings caught in it. After he does that two or three times he lays back down to go to sleep and probably an hour later he will do it again. Or he will wake up and walk around and sounds like he is wheezing. I brought him to the vet to get an Xray to see if he had a collapse trachea and she told me she can't tell and that she has only seen that twice in her whole career. Does anyone know whats wrong with him? PLEASE HELP! I feel so bad like I can't do anything!