Why Do Dogs Pant?

You’ve seen dogs pant, but do you know why they do it? And is it true that dogs can’t sweat? Quick Questions has the answers!
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Sources:
http://www.petmd.com/dog/behavior/evr_dg_why_do_dogs_pant
http://dogcare.dailypuppy.com/dogs-pant-2875.html
http://www.wired.com/2013/11/how-do-things-cool-with-evaporation/
http://www.petplace.com/dogs/how-do-dogs-sweat/page1.aspx