It's funny about the salt water drinking.
Frosty mostly won't but sometimes she accidentally gets a gob full and you can see her slow down because of it.
Our kelpie heeler x used to drink it a lot, and vomit a lot before we could get in the car to go home.
It takes a lot to get Frosty to drink any water until we get home even though i sometimes carry a bottle with a sucky top to squirt in her mouth. And I usually have buckets of fresh water to wash the salt water off her before we go home. Salt water tends not to dry very quickly - ie if the dog's fur is still salty - it stays wet longer than when fresh water. And then the damp feeling stays a long time.