Usually a virus: These are typically viral and self heal over time. As long as the mouth sores don't interfere with his ability to keep hydrated he should do okay. Chilled drinks, chilled applesauce, or popsicles help reduce the pain of the sores and promote hydration. If he gets to where he won't pee at least once every 8 hrs he's getting dry & may need to be seen.
Answered 3/23/2022
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