I have a 2" RES that's been frequently gulping/biting without there being any food around, almost as if it has something stuck in its throat. Occasionally it tries to claw at its face too while it does this. I've tried looking in its mouth, but it's so small that I can't really see anything. This has been going on just today. It's eating and behaving normally otherwise however.
Is this something to be concerned about? If a vet is needed, how long should I wait to see if the problem resolves itself?