Having had both male and female weimaraners, I have to say that I disagree with 5029. All of our dogs have had very different personalities within the weimaraner spectrum and they have all found different things easier or harder to learn, irrespective of whether my husband or I was the trainer. Also once they understood what was wanted, they all displayed the same level of decision making over whether to obey or not!!!! Now if you had said horses, I definitely get on better with geldings or stallions rather than mares.