I was looking for a way to permanently mark my soft furs to keep from inbreeding as much as I can. New blood isn't exactly easy to come by here in WV. I came across some information on labs tattooing animals and it went from there. It wasn't cheap by any stretch of the imagination, but I purchased a tattoo system from a company that specializes in that lab work and took their training classes.
It's quick, it's easy, and it's permanent. The ink I use is non-toxic and made for food animals. I don't get crazy with anchor or Love Mom tatts, but I just use a serious of dots and dashes.
I'll try to get some pictures next time I tattoo a batch of weans.