Favoring one foot

[Bricheze]

My 8 day old buckling is favoring is right foot. It was really bad when he was 0-2 days old, bending out kind of funny, I gave him a BoSe shot, and it got better to just a slight bend in while he was walking, but now that he is more old and active, he is starting to favor it again, and was limping on it today... how long does the BoSe take to 'fix' this issue? Should I do something else to help him out? Does he need more selenium or another shot?

I just want to make sure that everything is well now, because a strong/durable structure is important in a pack goat and if there is something I need to do now, then I want to do it.