causes of black discharge from dogs ears
Dogs with large floppy ears, such as Basset Hounds, are prone to infections as their ear canals have poor air circulation, trapping moisture and allowing bacteria and yeast to grow. Dogs with ear infections caused by yeast usually have a black discharge; this is commonly second to an allergy. Dogs with bacterial ear infections often have an organism called Staphylococcus; in rare cases a more serious infection is caused by a bacteria called Pseudomonas.