What is the first sign of dehydration?

Two early signs of dehydration are thirst and dark-coloured urine. This is the body's way of trying to increase water intake and decrease water loss.
Other symptoms may include:
dizziness or light-headedness
headache
tiredness
dry mouth, lips and eyes
passing small amounts of urine infrequently (less than three or four times a day)

Hope this helps
Plz mark as brainliest

Administration and victim