You're definitely not stupid. ^^ It is a commonly asked question.
130+ pounds is heavyweight, as that gives +5 damage / -5 agility. 109 pounds or under is lightweight, as that gives -5 damage / +5 agility.
https://wolfplaygame.com/gameguide.php -- The game guide has all the weight ranges and respective damage/agility points under "Wolf Character Attributes". Hope this helps.
Fall Month: 1 
Night 
Heavy Rain Moon: 
