Three friends — George, Harris and the narrator.
The Dog- Montmorency
He is a hypochondriac. He has the habit of imagining that he suffers from the same disease as described in the patent medical advertisements. He is very friendly with his doctor. He hates to go on a sea-voyage. He narrates to his friends about what happened to his brother-in-law and a friend.
Harris thinks that he suffers from fits of giddiness. He pretends to be interested in sea-trips. He thinks that all of them need rest and a holiday.
He likes to talk in medical terms. He suggests to his friends that they should undertake a boat trip. His suggestion surprises his friends think that he is incapable of making such a suggestion. He is considered lazy by his He weighs about twelve stones.
He opposes the suggestion of going up the river. He doesn’t like outside scenery. He is not allowed to run after a rat.
The three friends — George, Harris and the narrator — discuss about their imagined illness. Then they decide to go out for a holiday. The readers can have a peep into the working of the narrator’s mind. They come to know how people suffer from sea-sickness and how they refuse to admit it in their conversation with others on land.