...(and other animals, including people).
At $219 this thermometer will probably be beyond most people's budget, but this is absolutely the best thermometer made in the world, especially for animals. It reads in seconds, has a waterproof probe, uses disposable probe covers, and can be used to monitor continuously, a feature necessary for dealing with shock, hyperthermia, etc. I just thought I'd mention this:
Welch Allyn 690 with rectal probe. Google it, also on Amazon.