Our puppy has a loose lump under his skin on the outside of one shoulder blade. Is this likely to be the microchip? Is the lump possibly a negative bodily reaction to there being a microchip? Or, it is worse than a microchip..

(Advance apologies for the long post) My wife and I had been talking about getting a dog for a while, but were still a bit undecided. We had decided that if we did get a god it would either be a Lab or a Golden, and we agreed that we would keep looking at the shelter from time to time, and if...