Pictured below is a close up of a dog’s nose. This dog had a black nose until it suddenly started to blister and peel. Eventually, all of the normal tissue was gone, leaving the dog with an open wound over the entire nose. With treatment, the condition improved to what is pictured below. What medical condition does this dog
Diagnosis: Discoid Lupus Erythematous (D.L.E.)
Lupus is an autoimmune disease in which the patient’s own immune system attacks free DNA. It most commonly affects the nose but I have also seen it on the ears and inside of the mouth. It is very common in collies which is why it has the nick name, ‘collie nose’. Although this dog’s nose will never be completely normal again, treatment with doxycycline and fatty acids keeps him comfortable.