Reddish Bug On Dog. The good news is, not all red rings following a tick bite indicate lyme disease. Interdigital cysts are growths that form between your dog’s toes, usually in the webbing.
A tiny fast crawling bug could be what is called a silverfish. Brown fur staining is primarily caused by an infection with the yeast malassezia. Any type of insect bite tends to be more visible and prominent on your dog’s paw.