Why do horses grind their teeth ? I feel as though it should be an indicator of pain or stress , yet he does n't seem to be in any pain and I ca n't figure out what might be stressing him . How can I get him to stop ? The noise is like nails on a chalkboard ... it gives me goosebumps !
What may the narrator do with the horse ?
Pick the best answer from the following options:
- They may extract their teeth .
 - They may allow it to keep grinding its teeth .
 - They may take them to the vet .
 - They may leave them alone .


They may take them to the vet .