My name is Bruce!

Meet bruce 8 month old Rottweiler/argentino mix. He can be a bit hard headed and dominate. With research of the 2 breeds he needs to have "a job" to work his mind , with his size he is deffinetly not one for an apartment/condo. He needs a yard. Bruce is potty trained and kennel trained. Bruce needs more. His ideal place/person would be someone who knows how to work with large dogs who are dominate and hard headed. Although he lives with a cat im not totally sure how he will do with them he is extremly interested in them but our cat hides so hes never fully met one. Would be best as an only child