What is the dog called in "Three Men in a Boat"?

The name of the dog in "Three Men in a Boat (to Say Nothing of the Dog)" was Montmorency. Author Jerome K. Jerome insisted that the three friends' journey down the River Thames did happen, though the dog did not exist, reports The Jerome K. Jerome Society.

Montmorency is described in the story as a small fox terrier, a bit disreputable and fond of killing rats, chickens and the occasional cat, while retaining a noble expression that could bring tears to the eyes of pious old ladies and gentlemen. Jerome claimed that he evolved Montmorency out of his inner consciousness, but that dogs he met later proved that he had it right.