Okay, I have an all white cat, something I have never had before. . . Is it normal for her to get what I call Boogers or dirty nose? She does not have a runny nose, but every week or so, she gets a blackish/dark brown what looks like boogers in her nose. Is it a normal cat thing and i have just never noticed it on dark noses, or is she playing around in dirty things (ie. dog toys) or what? Any advice?