* Genetics are complex: The mix of breeds involved will influence the size. A Border Collie tends to be 35-50 pounds, while a Labrador Retriever is 55-80 pounds. The mix could lean more toward one breed or the other.
* Individual variation: Even within the same litter, puppies can grow to different sizes.
However, here's a general guideline:
* Average weight range: A Border Collie Lab mix female could likely weigh between 40 and 70 pounds.
* Height: She could be around 18-24 inches tall at the shoulder.
To get a better idea:
* Ask the breeder: If you're getting your pup from a reputable breeder, they may have an idea of the parents' sizes and could give you a general estimate.
* Observe siblings: If you can, look at siblings from the same litter to see their size and growth patterns.
Remember, every dog is an individual, and their size is just one part of their unique personality and charm!