Board Thread:Off Topic/@comment-26893431-20151114142044/@comment-26987392-20151114224836

Here we go:

Note: words in italic may not represent their actual meaning, but are rather CK terms(e.g. actor means any character in-game).

Odahviing, Paarthurnax and the dragons at the Thorat of The World can be friendly or neutral to the playerFaction(Odahviing is briefly agressive during the main quest and Paarthurnax can become agressive if you deal enough damage to him), it is possible to verify that using the Creation Kit. All other dragons are agressive and should attack the player on sight.

Actually, dragons are agressive to most factions in-game and should attack pretty much anything. If it is close to you and it isn't attacking you, then he should be targeting another entity.

What happened to you may be explained by the dragon having targeted another entity that is rather far from you(dragons can notice enemies from really far). It may also have glitched and not recognizing the game's instruction to enter in combat state agains you.

Or, the game may also be coded randomly spawn dragons neutral/friendly to playerFaction near the player. This is likely hard/impossible to verify since those dragons shold be spawn and disappear quickly, not being actual actors and thus you can't find them at the Creation Kit.