I think Wargs are certainly bibber than any Hobbit because they must be enough to carry the Goblins riders.
Xavi wrote:
Jacksonian orcs are almost double the size of orcs in the books, for example (they are as big as scrawny human adults, or bigger), and I tend to believe that other dark creatures are more or less doubled in size as well
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That's something I've read around here quite a few times. Let me post some quotes from The Hobbit:
Out jumped the goblins, big goblins, great ugly-looking goblins, lots of goblins, before you could say rocks and blocks. There were six to each dwarf, at least, and two even for Bilbo;
They were big for Bilbo. Dwarves weren't, so they were at least bigger than a Dwarf meaning they are at least the size of a short Human.
There in the shadows on a large flat stone sat a tremendous goblin with a huge head, and armed goblins were standing round him carrying the axes and the bent swords that they use.
Of course the Great Goblin was the biggest of them all. "tremendous" sounds lke he's taller than your average Human.
The passage was low and roughly made. It was not too difficult for the hobbit, except when, in spite of all care, he stubbed his poor toes again, several times, on nasty jagged stones in the floor. "A bit low for goblins, at least for the big ones," thought Bilbo, not knowing that even the big ones, the ores of the mountains, go along at a great speed stooping low with their hands almost on the ground.
So there are small and big Goblins. The big ones are certainly taller than a Hobbit, although when they run they stoop. If we assume that Goblins have Human proportions, and they run "with their hands almost on the ground" it means that standing straight (when not running) they can be twice as tall as a Hobbit which means Human size.
Now, let's see which size were the Warg-riders:
The goblins gathered again in the valley. There a host of Wargs came ravening and with them came the bodyguard of Bolg, goblins of huge size with scimitars of steel.
At least Bolg's guard were Goblins of Human (or bigger size) riding Wargs. So Wargs need to be big enough to carry them meaning than Peter Jackson was not far off regarding Wargs size!