A lost film. Dr. Crawford and his wife with their little daughter, Elsie, are at home amusing themselves with the Scotch collie puppy, Imp, when another doctor is announced and he is shown an article in a newspaper which describes the providential rescue from drowning of the doctor's child by Lassie, the mother of Imp. Two more physician's arrive and announce that they have come to try an experiment with a newly discovered anesthetic. Dr. Crawford has a guinea pig, on which the experiment is to be tried, but it is discovered the animal has died, and the men of medicine are in a quandary. It is finally decided to use Imp, the puppy, for the experiment, despite the mild protest of Elsie.