Hi! This is my first post and excited to learn more about our new poodle. We have a 10 week old Moyen Poodle. She is the best. But, I am wondering. Last week I saw her belly look "dirty." I thought it could be dirt but it didn't clean. so I left it. I have noticed that it is "spreading" or more of her belly is dark. Not that pink puppy belly color. I have attached pictures. As this happened to anyone else?