Reasons why Gandalf is not a dwarf:
1) He's taller than any damn dwarf will ever be.
2) He can use magic and is one of the 5 great mages, and none of the 5 mages in Tolkien's world are dwarves.
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Worshipper of Tiax.
Wielder of the ancient Lawyer spells.
Member of the HADB clan.
Ally of the Fluffy Queen and the Dreaded Red Fluffy
General of the highest class and Leader of the Legal Department and Jumprope Compound in the IW Peacekeeping Force.
I've also got a pretty long sig.