The dogo's muscles are meant for endurance, not weight lifting. If you are expecting some big beefy, power house, you have the wrong breed. Look at the photos on this website. Notice that the dogos pictured are in great condition. Large, powerful muscles.
None look like a bodybuilder.
Build muscle on your dog by engaging in exercise. Those are great ways to build muscle on a Dogo. You are engaging in exercise that strengthens the muscles that the dogo would use out in the field hunting. If it is under a year old, hold off on serious road work. You don't want to cause any structural damage to your dogo.