If adog's bodily water can exit through the bottoms of their feet, then from which part of a dog can bodily water escape?

Answer choices:
- Veins and arteries.
 - the skin
 - aqueous solution
 - Endocrine system
 - epidermis and dermis
 - Pituitary gland
 - pituitary
 - bottom of feet

 

        bottom of feet  