What great things will they come up with next? This is a two piece set Best Friends Necklace and Dog Tag.  18" Link Chain plus a 2" extension chain making 20" in possible length total of the necklace. Pendant that hangs from necklace is .66" wide x .70" tall. Same dimensions for pendant that hangs from dogs clip...Total height from dogs clip to bottom of pendant is about 2". Can clip on to collar or dogs necklace. Both are Made of Lead Free, Nickel Free Alloy.  We wear friendship necklaces with our friends, partners and lovers....Who better to share a Best Friend necklace with than your dog....Your loyal companion who shows you love always and that you adore!  What a trendy and unique way to say...I Love my Dog!