A small P.S. to this...
I'm scared of sticks. Sticks can cause damage to dogs' mouths, teeth, gums, and even cause choking if pieces are swallowed.
Yes, my dog likes sticks too. But I got her a plastic frisbee instead :-)
Oh my gosh! I have absolutely NO idea what that could have been. By now it will have been spat out, swallowed down and come out the other end...or whatever. But the main thing is it has gone! Is there no bleeding, or soreness where this was attached?
There may be no recurrence. Just keep an eye on him, I would say, and anything else peculiar that you see, or if he shows signs of being unwell, do take him to be checked out. But otherwise....bye-bye horrible mysterious thing in my dog's mouth!
(Once my dog had a cyst which was about 1/4 inch across. I took her to the vet for it to be checked out, and they said it was a benign cyst. One day it was there...the next it had totally disappeared!)