What can i feed my dog to give him strong and healthy bones?

The simple answer to this is a good healthy diet! I am against supplements in almost all cases because in general all good dog foods supply all a dog needs and to add supplements is to unbalance the food.

Think of it in these terms. Suppose a dog needs 4 essential elements in its food and suppose you add to three of these. The dog would then not need so much of these and by reducing the total you would in fact be back to the same levels for the three elements but the fourth would in fact be insufficient! An over simplification I know but basically correct for all that.

Regards, John

Any good quality balanced food suitable for your breed and the age of the dog will be fine, suplements are to be avoided unless you are feeding a diet you are making up yourself and then they may be needed.