Do dogs sweat like humans

Yes. When a female dog is in heat she does bleed, much like a human. Although with some dogs, it can be difficult to tell if they are in fact bleeding. I have a female that keeps herself very clean during those times. I keep an eye on how often she is cleaning that area of her body. If she cleans it more often than normal I can pretty much assume that she is in heat or coming into heat and ready for breeding.

If you don't want your female breeding please remember to separate her from any unaltered males you might have.