As an avid reader of Daily Writing Tips, I just discovered that when I named my small dog 'Doggy Dog' that I committed a hypocorisma, which is a diminutive and a pet name. It can also be a diminutive name or an altered name. I didn't call her 'bow-wow' though. Altering a name, or just addressing some one as 'dear' can be rather condescending if one doesn't really know the person. Small children and elders are often addressed with hypocorisma... which can be insulting or infantilising... depending on the situation. So normal speech is more respectful, it avoids the dumbing down of the person spoken to.