The puppy and medicine woman

Thor paid a visit to a wise medicine woman (aka. his new vet) named Dr. Smith. He wanted to make sure he was eating the proper puppy foods and had taken all of his magic potions (shots) to grow into a powerful puppy warrior someday.
Dr. Smith examined Thor with great care from head to tail and found him in excellent condition. Except for one thing: his right eye. It appeared to be perfectly healthy but for some unknown reason, he could not see out of it.
This bit of news troubled our puppy. How was he supposed to catch the treat thief with only one eye?
The wise doctor said that with his super puppy hearing and scent tracking skills he could make his quest. She also told him about a powerful eye wizard (an optometrist) who could further analyze his eye.
Not all was lost. His journey would continue.