Doesn't really look like a microchip, but it could be.
Potential Microchipping Problems
Pet microchips are inserted underneath your pet’s skin right between his shoulder blades.
This poses some problems because on occasion the microchip can migrate under the shoulder blade or up to the back of the neck -- or even all the way down to the belly.
So if your pet has been microchipped, make sure you have a vet scan to identify exactly where it is. Once you know where it is, check it once a week to make sure there are no changes, at that it doesn’t feel any different.
If you can feel your pet’s microchip, it will feel like a grain of rice under your pet’s skin.