Answers: Hello, just for comparisons sake my mannish aussie weighed around 20 lbs at 11 weeks his brother was a little heavier. At 3 1/2 months he be 28 .5 lbs and at 8 months he is just over 55 lbs. and 21 inches tall. The breeder says he may gain for a moment more but he should be close to full grown. I know males may tend to weigh a little more than females. If you google the australian shepherd club of america it list the standards for the breed. I hope this helps.