When they pant, wander around looking for shade, and finally stubbornly lie down and refuse to walk, your dog is telling you something, and you probably don’t need a dog whisperer to figure it out: Your canine friend is hot, and telling you in the adorable way that only dogs can.
Source: LifeHacker – Dogs Can Suffer Heatstroke, and Other Things to Know About Keeping Your Pet Cool in the Summer