
"the fact that dogs that are bred, owned and handled (showed) by the same person never wins.
Does anyone know why it is so? I mean what has the quality of the dog got to do with it....... and one more thing, my dog gives the best presentation if I'm handling him. He kind of never feels as relaxed and as confident if he's with someone else. "
It's not so. There is even a special class called "bred by exhibitor" in which only the dog's breeder can show the dog (although they don't necessarily have to be the owner of the dog.)
Dog showing in the U.S. is more competitive, there are a lot more shows, and the distance between shows can be huge - so if an owner really is intent on finishing their dog to its championship they may choose to use a professional handler. By competitive I don't mean it's more difficult to get a championship on a dog, in fact, it's the reverse - it's easier because dogs do not compete against finished champions for their championship points.
The propensity to use professional handlers also depends on the breed. I used to show Cairns and GSDs. Cairns there are many owner handlers and breeder-handlers. GSDs there are very few owner-handlers. GSD showing is extremely competitive because their are such large numbers shown, so besides just the effort of running around a ring with a GSD being impossible for many owners, if you have a judge that's unsure of him or herself they are likely to feel more comfortable giving the nod to a dog handled by professionals. I don't think it's entirely different here either - a well known handler or a well known breeder is likely to be recognized and all things being equal their dog given the benefit-of-the doubt over an unknown.