A Dog is a Dog 1st and formost and they can bite "PERIOD" no matter how friendly.

Where did you get the dog? If it was from the SPCA then you don't know too much about its temperment, it has had a whole year with who knows? The liability of a child getting bit is huge so I would keep him seperate until you feel more comfortable. Maybe let the kids have doggie time for a few minutes each day to pat feed it treats etc...but be with them at all times while they are with the dog.

Animals are like people we don't always like everyone!

Good luck with your new dog and they can bring so much happiness to a family!