I posted about Halo earlier on this thread, but I don't think I posted Dena and Keefer.
Dena: 63 pounds (13 pounds over average female, 5-1/2 pounds over average male)
Keefer: 56 pounds (1-1/2 pounds under average male)
Halo: 46-1/2 pounds (3-1/2 pounds under average female)
As you can see, there is a large range of "normal" weights, even if they're above or below the average. As adults, Dena was about 72 pounds, which is slightly over the female standard of 48-1/2 to 70-1/2 (approximate conversion from centimeters, which is how the standard is written), and Keefer at 80 pounds, is well within the male standard of 66 to 88 pounds. Although Dena, his half sister, was larger at an earlier age, he ultimately ended up outweighing her by 8 pounds. Halo is now a year and a half old, and 58-1/2 pounds, which puts her almost exactly at the midpoint for a female.