While there is no one best kind of dog to be around kids, there are many kinds of dogs that get along well with children. Some of these are Golden Retrievers or Poodles. More dogs that get along well with kids can be found at http://dogs.about.com/od/dogbreeds/qt/dogsforkids.htm
any dog is a good dog for a child if you buy them when their babies and raise them with your child. My husband and I have a 3 yr old 2 yr old and a 10 month old and a 70 lb pitbull and she loves all are kids. The best type of dog for a cild who be a breed dog.
If you do not have a dog yet, wait till your kids are a bit bigger before you get one (I am not saying don't get a dog, dogs are great as part of a family but with very young kids there may be hygiene problems that are best avoided)
my sister has a blood hound they are very active in ther first 2-3 years of life they will always want to play.when your kids move out the dog will calm down..mostly because they have matured. that's probably the perfect dog for you.