I am thinking about adding a third Jack-I already have 2-both are altered. The male is 7, the female is 2. The male is mostly the alpha-but they do share the wealth. I do dog-sit a friend's female freqently and they do all get along. I want to get a third and was wondering what my best choice as far as sex goes. I am leaning more towards a male as my male doesn't play that much with the female-he is the more aggressive of the two and ignored the female when we brought her home. I'm not sure whether I would be keeping the third one in tact (whatever sex we get)-would depend on the quality. Was wondering what might be my best decision.