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How to train your rottweiler puppy with simple commands 
Start early and short. 
Puppies can be taught simple commands starting at seven to eight weeks of age. The key to training is to make each session fun and short.
A minute or two for each month of age up to 6 months is a good ballpark figure. Trying to do more than that will not benefit you or the dog because his attention span can't handle it.