Why does the author say, “Toto was not the sort of pet we could keep for long”?

Though Toto was pretty and clever, he was very mischievous and damaged the house by breaking dishes, tearing clothes and curtains. He also scared away the visitors by tearing their dresses. Furthermore, he didn’t get along well with other animals in the house too. One day he crossed the line by picking up a dish of Pulao and climbing a branch to eat it. When scolded he threw off the plate and broke it. That’s when grandfather decided that Toto was not the sort of pet to keep for long and he had had enough of the losses.

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