It is normal for a Bichon Frize's nose to turn from black to pink. As the dog ages or the weather turns colder, their nose will turn pink. At this time, the owner can take the dog out to bask in the sun and supplement vitamins or lecithin, etc. It can alleviate the pinkness of the dog's nose. In addition, some dogs may have discoloration of their noses due to plastic allergies. Therefore, it is best for owners to replace their dogs' food bowls with stainless steel ones.