As a Bichon gets older, cow-like spots and splotches may appear on its belly. The spots are more prominent with a summer haircut or after a bath. This is an accumulation of melanin that is genetic, and is a normal response to sun exposure in white or light-colored dogs. Likewise, the pigment of a Bichon's nose may darken after a summer's worth of outdoor play, and may lighten with less time spent outside.
Foot chewing may be a sign of allergies or irritation. Bichons are prone to allergies, so a dog who often chews on its feet should be seen by a veterinarian to rule out an allergy, injury, or other irritation.
While the pinkish- to brown-colored staining on a Bichon's face and body may be caused by eating, saliva from grooming, or walking through dirt and mud, some staining may be related to eye conditions or other health problems. The first step to preventing staining on a Bichon would be to speak with the veterinarian to rule out a medical concern. If there is no medical cause for the staining, regular cleaning of the stained areas and wiping tears from the eyes may help. Iron in water can cause fur discoloration, as can dog food that includes dyes. Keeping the facial hair trimmed and wiping the dog's face daily can minimize staining due to food and water, but it may never fully prevent staining.