Your Lab would make two of mine.
She's 42 pounds, will be 5 on March 1.
She isn't a very calm dog either! We got into agility in self defense, to try to burn off some of that energy.
. . . you can see she is a little thing, only 20" at the shoulder, but boy can she hit those weave poles!
Mine is huge. Her dad weighed 120. Tons of pics of her on my profile page.
I had a lab about twenty years ago that only weighed about 55 lbs. I think it is pretty rare to get a female as big as mine. I'm happy about it, though.