If the animal is healthy and well hydrated there is no reason to go to a vet, you can but it will be a waste of money.
The animal is an adult and knows how to eat (obviously would not be that age and size if it didn't)
It is frustrating but the only thing to do if the husbandry is on spot is to wait it out until the animal resumes feeding.
No force feeding, no assist feeding no tube feeding but PATIENCE
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