How Often Should Dogs Be Bathed? Dogs do not have sweat glands. This is a clear indication that the dog has a different skin than the human. For this reason, dog owners should focus on other personal care of the dog. Such as dental care, nail care, hair care. Otherwise, if these cares are neglected and the dog is only washed, it can become fatal. It is necessary to set a seasonal bathing interval for dogs. In summer, dogs should be bathed once every three to four weeks, but in winter, they should be bathed once every 6-7 weeks in order not to get cold. If dogs are washed more often than these intervals, the vitality of the hair will be lost and health problems will arise. The risk of contracting a fungal disease will increase, they may be infected with ear infections and they may forget their self-cleaning properties.