I happen to be in that situation just 14 days ago. I had two snakes sneeze and make wheezing sounds. They had their mouths open and yawned all the time. I went to the vet and got Baytril oral injections. I treated them 10 days one time per day and after only two days sympthomes disappaered. Right now almost a week after treatment still no signes of any illness and one of them has already eaten again. Good luck with yours!
:if your snake has a cold, other then take him to the vet? :I think my corn snake may have a cold, he sneezes often and his last shed was awfull. So, untill his vet apointment, is there anything I can do?