Ring Worm Communicative Ring Worm?

Ring worm? - ring worm communicative

I have a winner cocker spaniel, it is perfect in every aspect, shipped across North America for breeeding. Is prepared each week. It is in 5 years and I lost a little hair on his feet and limped a little. I do not see any wounds. Vet said it could be ringworm, you see that?
It is a special dog, in fact, I believe, saved more lives than Lassie.