What causes white circular spots on a black rottweiler?

White circular spots on a black Rottweiler can be caused by a variety of factors, including genetic traits, skin conditions, or exposure to environmental factors. Some Rottweilers may inherit a white marking pattern from their lineage, while others might develop spots due to conditions like vitiligo, fungal infections, or skin Allergies. If the spots appear suddenly or change in appearance, it's advisable to consult a veterinarian for proper diagnosis and treatment.