This claim is unverifiable. There is no scientific evidence or reliable cultural record linking a "white german shepherd – labrador – kangal mix" (or any dog mix) to luck. Dog breeds and their appearances are determined by genetics, not superstition. No reputable source supports the idea that encountering a specific dog mix predicts fortune.

You can verify this by searching for peer-reviewed studies or folklore databases (e.g., Google Scholar, Encyclopedia of Superstitions) using keywords like "dog breed luck omens."