The standard advice for a spaniel after a swim is to dry the ears. On Long Island Sound that advice is incomplete, and the gap is where the recurring bills come from. Towelling a salt-wet ear spreads the salt around rather than removing it; what stays behind is a crust in the feathering and a residue at the canal entrance that continues to irritate for days.
The fix is one extra minute. Rinse the head and ears with fresh water before the towel comes out — a jug in the boot of the car is enough — and then dry as normal. Sand matters too: Seaside's beach sand works its way into the ear feathering and behaves abrasively once the coat dries around it.
None of this argues against the Sound. Summer water temperatures here climb into the seventies, and for a breed rated 4 out of 5 on exercise need, swimming is the least joint-loading way to burn energy that exists. It simply means the after-swim routine in a coastal city has two steps rather than one, and the second one is free.