ANSWER:
1/2 lb
Explanation:
We can look at the 8 puppies, where the heaviest has a mass of 6/8 pounds and the lightest has a mass of 2/8 pounds.
We calculate the difference between these two weights, like this:
![d=(6)/(8)-(2)/(8)=(6-2)/(8)=(4)/(8)=(1)/(2)\text{ lb}](https://img.qammunity.org/2023/formulas/mathematics/college/dqprc94np0a7sg18psdwx0ep98b30par74.png)
What you mean between the weights is 1/2 of a pound