What does it mean when my dog’s nose is dry and hot?

Dogs and cats, unlike humans and horses, do not have sweat glands in their skin. Excess heat is dissipated through mucous membranes (nose, mouth, sinuses), and to some extent the feet. Panting is the primary way that dogs regulate and cool their body temperature. A dog’s nose may alternate between wet and cool, and dry and warm, depending on their need to thermoregulate.