
If i were you, id get hold of a copy of 'Give your dog a bone' and also 'grow your pups with bones' both by Dr Ian Billinghurst.
Whilst the weight of your dog seems fine, lean being preferable to fat, i would question if you are giving perhaps a little too much exercise to a dog who has not finished growing yet. Even when he has acheived his full height, his skeleton is still hardening, and probably wont be fully mature until he is over 2 years old. This does depend on what sort of exercise you are giving your pup. He is going to be a large, adn fairly heavy dog, when fully mature, which wont be until he is over 2 years old (im not talking mental maturity, im still waiting for all 3 of my crossbreeds to reach that!). Playing, training and swimming will be more beneficial, and less harmful to his bones and muscle growth than lots of running and walking. Also make sure you let your pup tell you when he has had enough! Or if he is the kind of dog that will go on until he drops down from exhaustion, keep an eye on how much he is doing. little and often is the key.
There is evidence to suggest that a lot of the skeletal disease in dogs is more down to management, ie feeding and exercise than it is to genetics. By this i mean, whilst a dog can be genetically more likely to suffer from hip dysplacia than another dog, feeding and exercise are what will cause it to occur, or not.
I would cut out the kibble entirely, you want to be feeding 60-80% raw meaty bones, and the rest is vegetables, offal and cottage cheese, eggs etc.
To feed vegetables, you need to blend them up to a 'pre chewed' consistency with a food blender, if you do a big batch once a week, you can freeze it, which i find saves money.
In the veg mix i feed, i use carrots, apples, sprouts, basil coriander, parsley, cabbage, fruits, tomatoes, nuts, mushrooms, celery, avocadoes, olive oil, and i somtimes add some minced beef/pork to it, and also garlic, and brewers yeast. I make enough of this to feed three mid sized dogs for a week.
For a dog the size of a mal, i would have thought that probably a couple of tablespoons full of that a day, with some fish for breakfast, and then chicken wings for dinner would be fine. You can also feed chicken carcasses, necks, backs, lamb ribs, lamb shanks (recreational not a meal!) and occasioinally add some liver, kidney, heart, and if you can stomach it, brains!
It goes without saying, or it should, that whilst dogs CAN digest bones, it makes sense not to leave them alone with any bone! just in case.
Em