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In the hours before the mistress comes home, Sheila paces the thick carpet and sniffs the corners where her old best friend used to sit. She imagines he is still lying there on the old red sofa cushion, tail curled over hindquarters, paws over nose. The leash hangs from a tack on the wall, from the special days when the mistress came back early from work with a bright yellow Frisbee in her hand. Sheila remembers the way the mistress would burst into cries of glee as she watched them, Sheila sprinting with her tongue hanging out of her mouth, and Gus trying to intercept her as they both ran to catch the flying yellow disc.

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The underlined part, "The leash hangs from the special days when the mistress came back early from work with a bright yellow Frisbee in her hand"..........

Hangs from the special days..... here "from" means "since"?

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Yes, but not exactly. It's like a piece of cake left over from dinner. This is an automobile from the forties.

Yes, it's been hanging there since the days when her friend Gus was around, but it's also a piece of the past - a sense which "since" would not convey.
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Wow. That little piece of writing made me really sad. Emotion: sad

I hope Shiela has a good life.