Help! How do I train my rats to let me get them into their leash?

the right leash helps! I have 6 rats (and one recently passed) and 6 of them tolerate leashes. We use a figure-8 style harness/leash from Four Paws (as seen here: a href="http://www.pettravelcenter.com/products/detail/568/37)" rel="nofollow"http://www.pettravelcenter.com/products/…/a I like this leash because it can adjust down small enough to put a baby rat on (I had a 150 gram 5-week old on one) and they lock, so there is very little size change when the harness is scratched at. I put them on tight enough that they can't get their elbows out - don't unhook it, just slide the loops bigger and smaller. Tighten around the ribs, then around the neck. Once you have your harness on, make sure you leave it for at least 20 minutes to get them used to it, and try to use it regularly, so it's not a big deal. Good luck!