The dog maybe a diabetic
Yes, all dogs urinate.
Urinate.
Yes.
they don't urinate on their food or drinking water
how much do we urinate
Dogs urinate, defecate and respire, these are all forms of excretion.
no
Their bladder tells them "it's time"
Their scent.
Yes you can, such as a cat has a litterbox. Only you'll have to train it to urinate in that place.
Male dogs lift their leg so they can direct their urine to mark their territory. They will typically urinate on the side of a post, tree or whatever is available for them to leave their mark on.
from their urethras the same as male dogs and ALL other mamals who urinate!