Both mine are micro chipped. Tucker had his AVID from having been at a shelter, so when I wanted Hannah done with the same brand (keep it simple), I had to go to a different vet to do it as our vets used Home Again. I never have had them checked. Maybe I'll ask the next time we are at the vet. At this stage in the game I would think that the vets would carry both brands of readers. When we move, I will have to remember to inform AVID.