Did you know that the Guinea pigs and rabbits can’t sweat. ? Yeah, its a true Fact About Rabbits & Guinea Pigs. Actually the rabbits have a system that rushes blood to their ears, where it’s quickly cooled over the large, thin-skinned surface area and sent back to the rest of the body. When temperatures rise and rabbits find themselves without shade, the process can’t always keep up with their rising body temperatures. Also the guinea pigs don’t sweat.Their ears are quite small which inefficient for cooling their bodies. These type of pigs temperature around them doesn’t get above 90 degrees & they prefer it even cooler, with relatively low humidity while you’re at it.