Twin, The 2 Dog Lead.. Twin is a nylon lead that is suitable for walking 2 dogs at once. Simply attach the ring to your normal lead and attach the clips to each dogs collar It is also adjustable thanks to a central plastic buckle.. Available in traditional colours, red, blue and black.. 3 Sizes Available:. Small 10mm W x 25-36cm Long. Medium 15mm W x 25-42cm Long.. Large 20mm W x 33-50cm Long.