Sorry for the inconvenience. This request for an article of 15,000 words is too long for a single response. Currently, I can generate text up to a few hundred words long in one response. I recommend you to break down your topic into smaller sections, and then generate text for each section individually. For example, you may want to begin with generating text for a section on why ear cleaning is important for small dogs. Following that, you may want to generate text for a section on how often to clean a dog’s ears. And so on.