 Sigfried treats Captain Crawford s sick horse. The Captain is a newcomer to Darrowby along with his apparently surly son, Hugh. James treats Arnie Braithwaite s dog, who may have diabetes. Dennis Pratt is seriously behind in paying his bills and the vets decide to have another go at him in the hope of getting something on account. Sigfried pays a call on the Hardwickes and again finds himself unable to get home - this time, he seems to have lost his car keys. James and Sigfried treat a badly injured dog.