Try a ShihTzu group on Facebook..there are some active ones.
But my guess would be from rubbing up against a bowl while eating, some kind of chew bone like a Kong or gnawing on cage bars depending where they kept him.
Check his teeth really good to see if there are any changes.
But my guess would be from rubbing up against a bowl while eating, some kind of chew bone like a Kong or gnawing on cage bars depending where they kept him.
Check his teeth really good to see if there are any changes.