As a dog groomer, how many raw fed, unvaccinated, chemical free dogs do you see? Very few, if any, I would think because groomers won't allow dogs that are unvaccinated. Diet has much to do with flees, a raw species appropriate diet provides the best nutrition for a dog to have a strong immune system and a truly healthy dog will not get flee investations, nor will they get allergies, hot spots and tapeworms, and if they do get tapeworms or a the odd flee, their bodies have all they need to rid themselves of them.
that is just so not true. Diet can help a dog be healthier overall but fleas don't give a damn how healthy your dog is. Raw diet is not the be all end all that people want it to be for keeping a dog healthy. Further unless you bred your puppy yourself it HAS had at least some form of vaccinations if the breeder/shelter was worth anything. My family has bred puppies and they all get wormed/vaxxed at a very young age since worms in puppies are exceedingly common.
Show me some kind of evidence outside of your ancedotal experience that feeding your dog the "perfect" diet and not vaccinating them is going to stop fleas from infesting them because like I said a flea doesn't care how healthy your dog is. A flea bites the dog, jumps off lays a ton of eggs and then jumps back on then all those little baby fleas are looking for meals to and while they have been living sneakily in your carpet they aren't going to NOT jump on your dog because of the way it is fed.