Before you can enter a life stage record for your puppy, you need to know some key pieces of data:

1. the age of your puppy in weeks, and
2. the expected mature weight of your puppy

We know our puppy is approx. 5 weeks old, and the expected mature weight for a female Border Collie at 16 months of age, based on the average of the smallest and largest individuals, is 15.5 kg [(12 + 19) / 2].

If you don’t know the parents’ weights, then calculate the breed average.