Dr.hayden walles and Dr. Christopher S. Baird wrote an article about dogs sweat glands .. and here we are quoting :
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** Lots of people know that dogs cool down by panting, not sweating. But that doesn’t mean that dogs don’t sweat nor does it mean that they lack sweat glands.
There are two different kinds of sweat glands. Epitrichial (or apocrine) glands are ducted into hair follicles. Atrichial (or eccrine) glands are ducted directly to the surface of the skin.
The primary cooling mechanism for dogs is panting. By breathing air quickly over the wet surfaces of the inner mouth and lungs, the dog's pants accelerate evaporative cooling in much the same way that a breeze across a sweaty person's skin speeds up cooling. Dogs also have a different kind of sweat gland all over their body. But the sweat emitted from these glands are used to counter rapid rises of temperature in localized skin patches that could lead to burns, and not to cool the body as a whole.
Most of a dog’s body is covered with epitrichial glands which are of importance for maintaining healthy skin. Atrichial glands, the ones that are so important to us, are only really found on the few bare parts of a dog’s body, like the pads of the feet. The moisture they produce helps improve grip.
The problem is that most dogs are covered with a thick coat of fur, so sweat secreted where there is fur would get trapped in the fur, fail to evaporate, and therefore fail to cool the dog down much. As a result, it is far more efficient for dogs to have sweat glands where there is little fur. For this reason, most of a dog's sweat glands are located on the pads of its feet and on its nose. On a hot day you may notice a dog leaving behind a trail of wet footprints as it walks across a smooth, dry surface. That's dog sweat.
To us sweating is so much about cooling down that it’s easy to imagine it serves no other purpose. Really though, sweat glands have many roles throughout the animal kingdom. For us sweat is about regulating temperature, for dogs it is about not slipping over. And though it isn’t really sweating as we know it, dogs do sweat **
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