well, I have only had my Dogos along with my Filas. the two breeds together make a very good team. the Dogo's bark when necessary,very rare for them to be a barky dog. I knew when the Dogos alerted I needed to check it out. they are fearless and do not get spooked easy. many times my Filas and Dogos crept across my yard and have protected me. whether it be 2 or 4 legged trespassing.
had a drunk one time attempting to enter my home at 3am and the dogs never barked. my Dogo Paco was hovering over me in my bed growling and my FIla Icca was laying next to be growling, very low but very scary! I slid out of bed and went down the stairs and could hear someone trying the handle in an attempt to open it. all of my dogs were with me and amazingly enough all were very quiet,but growling. I turned on the porch light and the guy yelled, which in turn made the dogs go CRAZY!!! they were head butting the 2 windows that were visible from the porch. the guy took off running! it was very funny.
Dogos do excel in French RIng and also well in Schutzhund. they are a versatile breed and with their loyalty and bravery are an awesome protector.