If you don't want to put a rat in the oven, a space heater works well (for me at least). I found that a hair dryer shot too concentrated of a hot air beam so once I was done warming one area and moved onto the next, the first area was cold again after a minute. Placing the rat in scalding hot water also warms the entire rat nicely (after its thawed) and does so relatively quick.

I had trouble switching my guy to f/t, and he liked MOVEMENT. I just wiggle my f/t rats for my BP, but my Borneo wanted to see that rat scurry around the tub. Quick, almost jerky moves also seemed to catch his attention more.

Dennis