How to Treat Dog Mites: Mites are insects that live on your dog. Microscopic members of the arachnid family, mites burrow under your dog's skin and lay their eggs. In small quantities, your dog won't even notice they are there. However, when the population begins to grow, the result can be inflamed, reddened patches of skin and incessant scratching. In the case of ear mites, a noticeable odor may come from the dog's ears, while the ear canals appear red and irritated.