There are so many colors and designs to choose from in dog collars.  From a steel dog collar to leather.  Make sure to get one that fits your dog properly.  One rule of thumb to follow is to get one that doesn’t fit too tight or too loose. Place two fingers between your dogs neck and the collar, there should be no more than the width of those two fingers between the neck and the collar. As far as color and design, that is really a personal preference.