The vet thinks its allergies as well. More-so because he only seems to be hacking/honking after he's been asleep. So we're changing up the detergents and he also suggested to keep a humidifier with menthol in the water near his bed area to keep his airways from drying out so much. Here in Texas the weather has been so hot and dry lately which is most likely the contributor. He has never been to a groomer (we do that at home) or around any other dogs so kennel cough was ruled out. Plus he just got his bordatella oral and regular injection a month ago. I noticed me and my hubby have been sneezing and coughing more lately too so I'm just placing the blame on the lovely Texas summer weather