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Because dogs skin is made up of goat skin like structure which does not have sweat glands so the evaporation process does not takes place then when it opens it mouth and through its tongue the tongue has saliva which contains water which can evaporate so evaporation is a cooling process which keeps dogs body cool in summer days.
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Panting increases thaie exposure to atmosphere and therefore it can help them to cool themselves faster. Hope it will help you. Dont forget to thank me.
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