Preparing for a Rottweiler- Diet and Excersise Benefits?

Okay I really want a Rottweiler, yes I am ready and am capable of taking car of one.

But, because of over breeding they now have week bones especially hips and shoulders and too much protein is bad for them. I was wondering if I could give them a special diet and excersise routine to benefit these problems and maybe even prevent a fatal problem. So for excersise, is swimming good for dogs bones and joints? I know its great for human bones, joints and muscles. And just to be safe with the hips I reckon I won't be teaching it agility with the jumps as it may put pressure on hips and possibly shoulders? I will of cause walk him everyday. Diet, well I want to keep a healthy, fit dog so I was wondering should I get high Quality dry food, wet food tends to make my previous dogs get runny poos, and too keep the bones strong would it be alright to feed my dog a special calcium milk or powder to sprinkle on the food for my dogs? Or can I get daily vitamins for that? I really want whats best and I need to prepare if I am going to get a Rotty!
- Thanks SO much- Paws Up! 

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