[header] How to train your rottweiler puppy with simple commands [title] Start early and short. [step] 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.