Great Lizards

[Knight Of Pentacles]

They count as "medium" sized creatures when they're quite gigantic.

[Howlando]

Pretty sure creature size is determined by creature model, so I guess this is a bioware bug. I'm sure they'll fix it promptly in the next patch.

[Paha]

It's determined by model and handled in .2da files. I could probably change it in haks if I recalled at some point future.