The height of labs depends on various things. It depends on how well bred your lab is. If you got your Black Labrador from the breeder than you can look at the father and mother, and guess how big your pooch will get. But, if your lab came from the rescue or humane society, etc. as a puppy there is really no way to tell the exact height. However, you can look at the paws of your dog. If their paws are big, it is going to be a good sized dog, but if the paws are little than it is not going to get that big. The height of dogs also depends on what your dog is fed and how it is kept. Generally, Black Labradors can grow to be quite large and females are smaller than males. While female labs typically grow to be between 21-23 inches in height, male labs grow up to 24 inches in height. Female labs typically do not weigh over 70 lbs., whereas male labs can weigh up to 100 lbs.