..well, not all the time, but he gets excited around her and starts pursuing her and licking at her arms and face. She is not much taller than him, and he's developed a strong prey drive around squirrels/birds and I sort of worry that he might be thinking 'prey'? 
It doesn't help when she gets nervous and squeals 'stop, MOUSE, STOP' in an injured tone (she's just 5), backing off at the same time. He gets even more excited (obviously). I do tell her to turn her back (he still jumps up), I tell her to say 'sit' in a calm voice - which helps when she is able to do it, but thats not often.
He does do it to me too sometimes, but for me its just a PITA and dealable with - for dd2, its scary and stressful.
He's 8-9 months old, lab x (staffy/lurcher/beagle??). I never leave them unsupervised. I tell him to sit, or 'down'. I've started getting dd2 to do bits of training with him - which is working well, but not made a difference so far. I get her to give him his treats/food sometimes.
Anything else I can/should do?