Just to clarify - I would never leave baby and dog together unsupervised.
My 5 mo DS is going to get mobile soon and my bull mastiff is very placid, in fact she has shown some protective tendencies toward me and baby (she was scared of loud noises such as fireworks and crow scarers and used to run off home but now 'escorts' me and baby home even though she is visibally frightened!) and I dont allow actual contact but she tries to tenderly lick his little hand.
DS is very interested in her - I can imagine he will try to be all over her when he gets mobile, is there anything i need to be aware of? - such as her claws when she plays etc etc
What experiences have people had with big dogs little babies?