I start sending my young dogs to caught hogs in the field at 9-10 months. At 11 months I start to send them first with finished dog right behind. By 12-14 months they should be good as main line dog if they have had enough catches under their belt.
Teeth should be real solid at 12 months.
You should think of a dogo as a straight catch cur dog. They should have quite a bit of hunt drive and really want to run and hunt. Some are dead serious early on but some can be playful like what you are describing. I try and let my young ones run down to hunt/run with my curs all I can to burn off that energy in a productive way and teach they to go look. A pup like that will not do well on leash, they want to hunt.
Just curious, you ever send them dogos on cattle. do they have any sort of "herding" instinct.