What's my dog worth?

Could you please enlighten me on the matter of canine valuation? I'm curious to know how one might determine the worth of a dog. Is it based solely on breed? Or does it also factor in things like age, health, and temperament? Perhaps it's a combination of all these factors? I'm particularly interested in understanding how the market for dogs influences their worth. Could you provide any insights or examples to illustrate this concept? Thank you for your time and assistance in addressing my inquiry.