Catch dog Jaw Muscle Cramp??????

Just an update.... It's been over 48hrs and the swelling has went down. He uses his mouth more and seems to feel better. He don't mind shaking his head this evening. Guess it was just a cramp or pulled muscle. He shouldn't be dehydrated. This was the 1st hunt in 4-5 months because of deer season. He has a 5gal bucket of water in his kennel as well. Skin of his neck shows no sign of dehydration. I tried to get the wife to go message his jaw muscles but........ I'll try him this weekend if he keeps improving. It's been a weird scenario but looks like it no big deal