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?
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