Hi, I'm considering moving to microchips for my goats from tattooing but know that, at least years ago, migration sometimes posed an issue. There are also some animals who seem to form tumors at the injection site, while other species do not; I'm not sure where goats fit into that, and if the coatings on microchips have minimized migration. If I go with microchipping, I would chip in the tail web and own a scanner. So, if I could hear from people who've used microchips. Love them? Hate them? and Why?? Advice for someone considering them? What size did you use (mini microchip vs standard)?