I current have 2 corsi and they are a guardian breed so yes they do tend to be more protective. They are also intelligent and require a firm but fair leadership from the start, if you aren't able to fill that role then yes they are more then capable of taking the control spot. If you are the one in charge and they respect that then you will have one of the most loyal, majestic dogs you could imagine. We have just added our first skin baby and they are doing well with her, but we do ensure they are not left alone with the baby and know that the baby comes before them in the pecking order of things. They share their space with 3 cats and we haven't had any issues, my 2 know that the cats are off limit in our house, but we are surrounded by lots of barn cats that they like to chase when they see them. Again something that you would have to teach the correct behaviour to. I have never had any experience with Roman Cane Corso although I do know people that have had or do have dogs from them. They do have a lot of dogs/litters and that makes me nervous about the amount of personal time that they might be able to devote to socializing the dogs/puppies but have been in the breed a while so I think would have good knowledge of their lines. In regards to guarantees, and this isn't in reference to Roman as I don't know what they are like, but it is only worth what the breeder is willing to let it be. I know a breeder that also guarantee temperament but when it came to puppies in the litter (and we aren't talking just one pup but 2-4 pups) having a temperament issue it was immediately the owners fault. Despite the fact that the female they held back as their prospect was nervous and had temperament issues of her own. So take that for what it is worth, until they are tested one never knows if they will hold up their end and temperament is always a difficult issue to prove who is at fault, or if they have to cover the contract what is consider a temperament issue that would be covered. If I can help with recommending any other kennels you are interested in please let me know. I don't know what area you are located in but am assuming that as you are into the Roman dogs that you are more partial to the American lines?