Final answer:
Agatha may have been evasive about acquiring pedigreed dogs due to questionable means, fear of envy or targeting, or feelings of guilt or shame.
Step-by-step explanation:
The reasons why Agatha might be evasive about how she acquired such a magnificent set of pedigreed dogs are not directly stated in the provided texts. However, there are indirect evidences that can suggest possible reasons.
Since many characters in these passages are depicted as surreptitiously acquiring items or are attuned to the value of certain goods, it could be inferred that Agatha may have obtained the dogs through questionable means, perhaps through theft or deception.
The value of the dogs might be such that Agatha is concerned about being envied or targeted by others, leading her to guard the origin of her dogs closely. Lastly, there may be a sense of guilt or shame attached to the manner in which the dogs were acquired, prompting Agatha to avoid discussing their origins.