Since he is only a year old maybe consider having his knees checked for Luxating Petella? It is a deformity that is common in Yorkies and sometimes requires surgical intervention.
It would be best to really know what you are dealing with before starting any treatment. Also some dogs do have allergies to these supplements. My senior Shih Tzu nearly died from the same type of supplement. It is an uncommon reaction but still I would advise caution.
It would be really uncommon to have joint degeneration in a year old dog. |