Answer

Hello. Although I can not make a diagnosis without an exam it sounds as if your guy may have trigeminal neuritis. Trigeminal neuritis typically affects a dog's ability to close his/her mouth and they have trouble swallowing. Here is a brief description:

http://www.petplace.com/dogs/trigeminal-neuritis-in-dogs/page1.aspx

The good news is that this condition is typically self-limiting and dogs can have a full recovery. If he is unable to eat he may need temporary supportive care and/or feeding tubes.

Often wet food mushed into meat balls can be more easily eaten by dogs with this condition. They can learn to toss them into the back of the throat and then swallow.

I recommend you make an appointment with your veterinarian tomorrow to have this diagnosis confirmed and to discuss any further care he may need.

I hope this helps!

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