Your expert opinion is much appreciated ,, He is young one year old
boy is this in the wrong place !!no calcium supplementation.
this might be panosteitis "pano" -- raised temperature , disinterest in food , pain, temporary - may shift on to other limbs , may go away , and then surprize you have inflammation again.
If that is the case let the dog rest, and let the dog decide when and how and far he wants to move around . No big walks or exertion.