My chick w/ the splayed legs is not doing so well. Its been a couple days and his leg irons came off on their own today and he's the same as we was. When he had his leg irons I noticed part of one of his feet just did not react to anything and even with the leg irons today he still had that leg going off to the side - worse than yesterday. I read a post somewhere that mentions Merk. What is that?