"Whether" and "if" are equal in such contexts. So, yes, it'll do fine. But if you were thinking of not pupping anything instead, then no, either "if" or "whether" must be there anyway.
30. Oktober 2019
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If you remove "whether", you must substitute "if"
It is not clear if the shirt is too big or too small
You have two choices - big or small so you need either "whether" or "if".
30. Oktober 2019
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