Hope you have better luck out of it than the ones ive seen. No grit whatsoever.
The ones that you witnessed most likely had some mastiff or bulldog in them
A dogo has amazing prey drive,
Take a look at the video in the history section. Amazing story about a family dogo killing a Puma that was stalking two little girls. I couldn't get the video to embed. Morocho has a face only a mother could love. GilThere is a breeder just outside of Atlanta they are not cheap though. http://www.dogoatl.com/