Remember consistency with motivational rewares and patience are key in training.
A puppy at 11-12 weeks of age should be allowed to go potty every 2-3 hours. Asking him to hold it from 10pm-5:30am could cause him to get an urinary tract infection. That is the reason he is going potty in the pen, he can't hold it that long.
For some reason I thought you had a Cane Corso. I believe we have another member with a CAO but I do not remember the name.
I had to look up the temperament of the CAO. This is what I found.
Independent, they stand their ground and do not back down. They are good with all members of their own family, however, they should be supervised with children. Outside the home they may try to dominate other dogs and are wary of strangers; they are guardians and will act as such. They like to bark at night and this may present a problem if you have close neighbors.Socialization is a must for the Central Asians, unless they are being used as flock guards.
They need an owner who understands the flock guard type and the temperament that comes along with it. This is not a breed for the timid or meek owner.
The Central Asian Ovtcharka requires a large yard, the larger the better, with a fence. They have a job to do (guarding). Small living conditions can lead to boredom and thus digging and chewing will be a problem. Even with lots of exercise these dogs like to be outdoors watching over their territory. They must have a securely fenced yard or they will expand their territory as far as they can.
The CAS would be great for the person who hikes or jogs. On days they are not taken for a hike or a jog, they need a daily, long walk. They may appear to be lazy when they are lying down watching their property, but they can be up and running in a split second.