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ex1) I like his dog, which has a long tail

ex2) I like his dog which has a long tail


Do the two sentences have the same meaning?

I don't think so.


Ex1) implies that he has only one dog, but Ex2) has the possibility that he could have several dogs.

Am I right?

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Yes.

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HoonyI like his dog which has a long tail.

It's unnatural to use a possessive (his) and a restrictive relative clause with the same noun (dog).

CJ