You should bathe your dogs every other week up to every other months depending on the type of dog you have. With dogs that only require bathing once a month you should use shampoos that are aloe based to help maintain the coats oil and skin health
Dogs need to have their toenails cut every 2-3 weeks. If you allow the toenails to grow too long, the nerve on the toenails will grow as well, preventing the shortening of the nail to the preferred length.
A dog's ears also need regular grooming, because they may harbor mites or bacteria, and other forms of health problems.