Try Ice
Not exactly the same problem - our dog (a 15 yr old miniature poodle) is calm but would never drink anything on our 15 hr trips back and forth (we now do 2 8 hr days, visiting my daughter in Cary, NC going and coming). Didn't matter if the car was moving or we were stopped at a rest area.
Anyway, the older he got, the more stressed he seemed, especially when it was hot out. We discovered by accident that he would lick ice, and when the ice is melting, will also actually drink up the water that results. So - now we take little plastic containers of ice, and if we run out, we get more ice at gas stations or fast food places for him to lick and drink.
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