I think if you pamper the dogs too much all you are doing is weakening their system.
There is definitely a lot to this statement. Dogs that do not do what they were designed to do from an evolution standpoint end up becoming weak the same way that humans, now that we have technology to do almost everything for us, are becoming fatter over time and more susceptible to disease. Dogs were designed to chew on bones and since they don't exactly brush their teeth, this is the only way for most of them to maintain their dental health.