Denise of sunnydogink.com shows us a microchip...like a piece of rice. In the 2nd pic, Denise shows where it is injected. When you see your vet, ask to be scanned to be sure your chip still reads. We saw a real cute kitten on TV that was paralyzed when a chip was injected into its spinal cord by mistake. A vet operated & he could walk again! Phew.