Bernese Mountain Dog
This friendly, affectionate breed of dog tends to be a lovely household pet. The problem with choosing this breed however is they only live about 8 years, which is less than most other breeds.
Bernese mountain dogs are also prone to cancer, so you might not even be able to enjoy a full 8 years with your new pet. For this reason, you might not want to get a dog that is only going to be around for a few years. It seems like setting you (and the kids) up for sadness later.