From the column "A.B. Awfully Bothered" by Rube Goldberg in the Reading Eagle on this day in 1936:
The liner Queen Mary boasts of the following features:
On the sports deck there is a dog hotel with 26 rooms, each with hot and cold running water. The faucets are marked distinctly so the dogs can readily see which is the hot and which is the cold. Dogs who cannot read will have to do the same as human beings--scald themselves first to find out which is which.