While trying to learn what a "dog" is, arash mentally compares every animal to his family's new puppy. if the animal is similar enough, he decides that it is also a dog. arash's puppy serves as a for the concept of "dog."

Arash's puppy serves as a prototype for the concept of "dog".

Explanation:

A prototype is a model for something, a primary one from which future things are based on.

In this case, Arash's puppy serves as a prototype since Arash is looking for similarities between it and other dogs and only when he decides that they are similar enough does he decide the others are also dogs.

answer; /// (culture);