Our healing crystal necklaces are made durable just for pets with double wire beadwork and extra strong clasps. They layer nicely with your pet's collar and you can add one or more of our healing pendants to complete the look and bring even more healing energy to your pet! All necklaces have a two-inch adjustable extension and feature our signature black Shungite bead that aids in protecting against EMF’s from 5G, cell towers, other radiation, and dirty electricity. Protect your pet’s health with this miracle stone. Clear Quartz - works wonders in strengthening inner health and overall balance. It also assists in strengthening the immune system as it stimulates the flow of chi. It also helps to aid car sickness, flea control, poor circulation, and more Size xs = 9-11" Size s = 11-13" Size m = 14-16" Size L = 20-22" (Contact us for custom sizes) *please don’t leave your pets unattended during wear and be especially mindful of taking it off during more robust activities