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Most dogs noises are cold and wet if they are healthy. Some scientist speculate that this is a method of keeping a dog cool because they don't sweat but it is not known for sure.
http://answers.ask.com/Science/Nature/why_are_dogs...
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There are two speculative reasons why dogs have cold noses. Some scientists believe that it plays a part in keeping the dog cool. Dogs also like their noses frequently. Both of these
http://answers.ask.com/Science/Nature/why_do_dogs_...
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Dogs use their nose in the natural cooling-down process, as moisture on their nose will keep them cooler, especially on hot days; licking their nose consistently keeps them cooled
http://www.ehow.com/facts_5152455_dogs-noses-wet-c...
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When a dog breathes out through his/her nose, germs and dog snot (sometimes, not all the time!!!!!!!) collect all the time. That is what leaves those marks on your window. Look at
http://wiki.answers.com/Q/Why_is_a_dog's_nose_wet_...
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