Weak front legs

Question
Hello Ken ...
A beautiful natured pup who's 14 months old and is HUGE. He weighs 140 pounds and has long spindly legs. He's been fed the very best (Wellness and raw meat since the age of 3months... He was abandoned) He tends to perch on his toes in a ballerina stance but his left foot angles out and lately I notice him favoring it a bit as if it hurts. Also he tends not to want to stand too long. I watched him standing and his legs quiver a bit as if his body is just too large.
I'm an orthopedic nurse and wonder if perhaps a splint to give him a bit of support might be good for him.
Extra calcium for those bones that are still maturing?
Thank you in advance ....
He's such a handsome boy don't want him to have problems in the future ...

Answer
We stopped using calcium in puppy foods because of the harm it can do in the form of over development.  There is sufficient nutrients in quality foods without the need for additives.

The problem could be genetic or over feeding.  Ask a vet, they know more about dogs than people trained in human problems only.

Ken