I would assume they'd communicate through regular wolf behaviour such as body language and howling (for further distance communication). I don't think telepathy or anything is needed, since their wolf instincts would make it so they would understand all the body language and verbal cues. Makes it more realistic, eh?

EDIT also I think I'm going to write an intro post now, since Cal has oh so nicely given me a reason to. However, I'm not going to have Sierra meet anyone yet. Just a glimpse into her life right now. It'll make sense.