From my own experience with Shamo LF I can say that large and heavy breeds with long legs undergo growth spurts that can easily bring too much weight on the then still soft and not sufficiently calcified bones, so I found it very important to restrict their access to feed during certain growth phases and add brewers yeast and silicea to help the tendons to keep up with the growth spurts of the bones.
Ever since I took the above mentioned precautions they no longer had leg issues.
The restricted feeding with additives during certain growth phases is also recommended for giant and heavy dog breeds like Great Danes, Irish Wolfhounds, Mastiffs and similar that also undergo growth spurts at a certain young age, to avoid bone issues like hip displasia, valgus deformaties and similar.
Ever since I took the above mentioned precautions they no longer had leg issues.
The restricted feeding with additives during certain growth phases is also recommended for giant and heavy dog breeds like Great Danes, Irish Wolfhounds, Mastiffs and similar that also undergo growth spurts at a certain young age, to avoid bone issues like hip displasia, valgus deformaties and similar.