Question

How can you say that Mrs. Pumphrey was an overindulgent but silly and
impractical mistress?

Answer 1

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yes, I think she was over indulgent as she provided him greed and laziness by things that he did not deserved and fulfilling his all greeds. She was doing silly mistakes and did not gave him proper diet nor proper exercise. She was also not able to handle him practically.

hope it helps.