Answer
Dogs have no sweat glands (except possibly between the toes, as shown in Figure 17.2). By panting, they cool their mouths and throat by evaporation, which then cools the rest of the body.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.