She is about 6 months old now and I am guessing weighs about 30-35 lbs. I will find out tomorrow as she is getting spayed in the morning. Our other mix pup weighs 25 lbs and she is a good bit bigger then he is. I did not see her parents. But her past owner said that the collie/ES was her parentage. It could have easily been a guess at whatever it was he owned. All I know is that she is EXTREMELY intelligent. I think she even has our past GSD beat in that department. She is not overly energetic like I have often seen in the BC. But she can pay some serious attention to anything she sets her mind on. She also likes to herd us, but nipping at the children's bottoms or the back of my legs. She has done many sits and downs to stop that little habit She is something special!