My dog never had this problem before but all of a sudden he just started licking constantly, not himself really but just like licking the air I guess is the best way to put it. Should I be concerned?
A dog licking the air can have a number of causes including pain, behavioral, neurologic, or oral causes. There is an article written specifically on this topic here:
As the article mentions, if this is a new behavior, it may warrant a trip to the vet so that they can check for signs of dental disease, if there are additional neurologic signs, and help rule out causes that may warrant additional diagnostics or treatments.