no increase to CR?
only LA +1?

AC: +6 (+4 Nat, +1 competence, +1 Dex)
HP: +2/level
Spells: free metamagic template.
Sences: listen +5 (+4 bonus, +1 Wis), spot +1, blindsence
Cold Resistance 5

should be CR +1, LA +2.

...and a pack of Bitter Born Wolves in high winds is way more deadly than a pack of wolves in a forrest.