Dogos are very awesome dogs!!!! They do have a tendency to animal aggression like the Pit Bull breeds, they as you have stated are used as catch dogs. Here is some well founded guidelines for the Dogo:

The Argentine Dogo is an excellent guardian of the home. Loyal to the family, playful and intelligent. It is good with children and loves to kiss and cuddle with those the family accepts. Dogos are easy to train. This is a highly intelligent, powerful dog who needs a firm and consistent, but loving hand. The Argentine Dogo is not a breed for everyone. All dogs are individuals and some are more dominant or possess a stronger prey drive than others. With the right owners even the more dominant dogs can be submissive towards all humans and other animals. This breed needs someone who understands how to display leadership. Humans who are firm, confident, and consistent, this breed needs rules he must follow and limits to what he is and is not allowed to do. The objective in training this dog is to achieve a pack leader status. It is a natural instinct for a dog to have an order in their pack. When we humans live with dogs, we become their pack. The entire pack cooperates under a single leader. Lines are clearly defined. You and all other humans MUST be higher up in the order than the dog. That is the only way your relationship can be a success. When you put this breed with a meek or passive owner, problems may arise as the dog will feel he needs to, "save his pack" and run the show. Adult Dogos can be aggressive with other dogs however, the Dogo does not usually provoke the confrontation but may if he senses another dog who is unstable. The breed needs an owner who can tell the Dogo it is not his job to put another dog in his place. Breeders should work with prospective owners to match the dog with the right type of person. They are good with other pets if they are raised with them from puppyhood. This white mastiff needs early socialization with other animals. It also requires early obedience training.

I love this breed....not as much as my Pit Bulls, but the Dogo is one hell of a bully breed and beautiful as well. Much luck with your Pup, be responsible and keep him a good and safe pet, you do owe him that!!!!

Well I think I have found out some of the reasons for his change in behavior, I came home early today to find my boyfriend and his friend out back with my dog rough housing with him. I immediately put a stop to this. Thank you to everyone who has given advice it was very much appreciated and we'll be continueing training and practicing our good manners.

 Quote: Gabrielle Meyer

Well I think I have found out some of the reasons for his change in behavior, I came home early today to find my boyfriend and his friend out back with my dog rough housing with him.....

You don't even want to read what my response to that would be.

Yes well my reponse to it was very vocal and he got quiet the talk about what would happen if he ever did it again.