It all depends on how well-socialized they are with the rabbits. Certainly don't leave them unattended and work with them very closely throughout introductions, and try to keep from scaring the rabbits or exciting the dogs. As to whether or not they're good with kids, that's a very individual thing as well and will depend on their socialization history, how the kids treat them, etc. I've seen many "killer breeds" that were the best babysitters in the world, while dogs from some of the top "family breeds" that growl, snap, or attack around kids. A breed really doesn't tell much when it comes to what they'll get along with, one would have to know the specific dog being referred to.