The most common type of dog collar is the standard flat collar. This versatile collar is typically made of nylon, leather, or other durable materials, designed to be comfortable for everyday wear. Flat collars feature a buckle or snap closure to secure them around the dog's neck and usually include a ring for attaching ID tags and a leash. Due to their simplicity, effectiveness, and comfort, flat collars are widely recommended for most dogs, serving as an essential tool for identification and leash attachment.