I don't think 3 months is too young to get microchipped. They stick a large needle under the skin and it puts the little chip there. I have...Boomer, Skye, Zoie, and Romeo all chipped. I think it is good as an alternative, although I wish they would start tattooing again. Microchips are only good if you bring the stray to the vet or to a shelter. And sometimes they don't read, or they drift and go undetected.