How old is the boy? Is he old enough to have learned that behavior? Yes, you will want to get him neutered soon, depending on how old he is.
Personally, I like the boy/girl combination. They seem to have fewer clashes than 2 females, although this always depends on the particular pups.
Good luck!!
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He is your friend, your partner, your defender, your dog. You are his life, his love, his leader. He will be yours, faithful and true, to the last beat of his heart. You owe it to him to be worthy of such devotion. -- Author Unknown