Here's what you should know:
* Shih Tzu's are known for their diverse coat colors: While they often come in white with black spots, they can also have a variety of other color combinations, including brown, gold, and cream.
* Puppy coat vs. adult coat: Puppies often have a different coat color than their adult coats. This is because their puppy coat is often lighter and softer. As they mature, their adult coat will come in, which can be darker and more textured.
* Genetics: The color of your Shih Tzu's adult coat is primarily determined by her genetics. The brown hairs you see around her neck might be a sign that those genes are present, and the color may become more pronounced as she ages.
* Sun exposure: Sun exposure can also slightly lighten or change the color of a Shih Tzu's coat over time.
To get a better idea of how your Shih Tzu's coat color might change, consider these factors:
* Her parents' coats: What colors were her parents? This can give you an indication of what to expect.
* How her coat is developing: Is the brown around her neck becoming more noticeable or staying the same?
* Her breeder's opinion: If you got your Shih Tzu from a reputable breeder, they may be able to provide you with some insight into how her coat might change as she matures.
Remember: It's important to note that every dog is unique, and there's no way to predict exactly how your Shih Tzu's coat will change. The most important thing is to give her a healthy diet and plenty of love, and enjoy the beautiful coat she has, no matter what color it turns out to be!