Season 4, Episode 21 - "Little Sister"
While dogsitting the Westons' dog, Dreyfuss, Sophia loses him. She buys a look-alike to hide her mistake, but Dreyfuss returns home. Sophia needs to return the replacement dog, but she can't tell them apart, so she asks Rose to help. What does Rose do?
She calls Dreyfuss by his name, and he goes to her.
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