Someone's dog's leash has been found.
He found someone's dog's fur in the apartment.
Are those sentences grammatical?
Yes. This common expression may interest you. Tom: How do you know this?
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Yes.
This common expression may interest you.
Tom: How do you know this?
Jim: My friend's friend told me.
or
I heard it from a friend of a friend. <<< This is very commonly said.
Clive