My name is Simba!

This little 2 year guy is loved, but growls at my grand baby and beats up on my other shihzu and bichon frise. He is very jealous of whoever gives him attention. He is very lovable and cuddly with me. He is sweet, but dominating. Ive never been able to get him house trained and having the other 2 female dogs has made it more difficult. He voluntarily crates at night, comes when called, and loves to be held.
His ideal home is to be the only pet. He would do well with a single person that wants companionship.
He is pretty good on a leash, but has NO FEAR of big dogs. He runs up and growls and tries to attack if not restrained. I was lucky that he wasnt hurt by a big dog just lately. Im too nervous when I walk him, when the baby is here, and when he is loose with the other 2 of my dogs.
He needs patience, consistency, discipline, and a strong owner of which i am none of the above.
Serious inquires only. I want him to be with someone who can love him an provide a great home.
He is 12lb