This section of the book is from the "Stories of Animal Sagacity" book, by William Henry Giles Kingston.
Some years ago, a stranger arrived at the house of a shopkeeper in Deptford who let lodgings, stating that he had just arrived from the West Indies, and would take possession of rooms the next day, but would send his trunk that night. The trunk was brought late in the evening by two porters, who were desired, as it was heavy, to carry it to the bed-room.
As soon as the family had retired to rest, a little spaniel, which usually slept in the shop, made his way to the door of the chamber where the chest was deposited, and putting his nose close to it, began to bark furiously. The people, thus aroused, opened the door, when the dog flew towards the trunk, and barked and scratched against it with the greatest vehemence. In vain they attempted to draw him away. A neighbour was called in, when, on moving the trunk, it was suspected that it must contain something alive. They accordingly forced it open, when out came the new lodger; who had caused himself to be thus brought into the house for the purpose of robbing it.
If you let lodgings in your heart to strangers, take care that your little spaniel Conscience keeps wide awake, lest some evening a chest may be brought in containing a thief who may rob you before you find out his character. The thief may be an evil thought, a bad feeling, shut up in a chest formed of self-indulgence, sloth, vanity, pride. At the first alarm, wake up, break open the chest, call in your faithful neighbour, and hand over the new lodger to justice.