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Dog only uses one side of his mouth

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First let me say that I am not a new animal owner, I have had dogs, cats, ducks, birds, gerbils, rabbits etc. my whole life.

My problem is I have a 7 month old Boston Terrier who all of a sudden will not use the right side of his mouth. When he licks, his tongue will only come out the left side, when he drinks, left side, even when we give him a "cookie" it has to go in the left side. I have already called our vet and can't get him in until Friday. I know in humans it is a sign of a brain tumor, but I have never heard of this in dogs. I checked his mouth and found no signs of a injury, his teeth are fine, breath does not stink, (well he does have doggy breath) I can't visually find anything wrong.

He has a great appetite, plays as much as ever, he even plays tug of war with us and the other dogs so there is no pain, nothing has changed but his tongue.

If anyone has any ideas/suggestions I would appreciate hearing from you. This is going to be a long week waiting to get him into the vet.