Lynn seems to think that those could be some bone fragments that worked their way out finally and that perhaps he's on the final road to recovery. I sure hope so. No, I haven't taken him to a vet. We have to be our own vets around here, unfortunately. I have to say, he is standing up more and even stood with the bad hock leaning against the other leg, tapped his feet and did a dance for one of the BR girls the other day. He must be feeling better.
Interesting about the spider bite, Cetawin. Whatever this is, better those fragments of stuff are out now! Maybe now the leg can begin to heal. Zane's quite a fighter.