So, I have a very confident dog...he literally prances when he walks...he has no shortage of self esteem- which I could learn from!  So, it is only natural that when I clip my new design on his collar, he knows he looks goooooodddd.  We love to adorn ourselves with beautiful jewelry and we love crystals that make us feel amazing.  I don't think there is any difference for our furry companions.  
Introducing...."Poochie Pendants."  These clips go right on your pup's collar. It is also interchangeable as a keychain for your keys.  I have personally stamped the metal heart with a dog paw, and on the other side I have inscribed the symbols for "peace, love, and happiness"- because that is what our dogs give us, and what we want to give back to them!  
Clear Quartz is especially known to clear negative energy- something your pet may be exposed to, just like any of us.  My dog had a strong reaction to this crystal.  It also comes in rose quartz and amethyst- see store.