The character of Siegfried was based on a real-life vet called Donald Sinclair. By a remarkable coincidence, the character of Basil Fawlty in Fawlty Towers (1975) was also based on a real-life hotelier called Donald Sinclair.
Oh, a little further than *that*, Hodgekin!
Mrs. Pumphrey: Not into the rose bed, Hodgekin! We wouldn't want Tricki to get pricky-paw!
Hodgekin: Who wouldn't?
Mrs. Pumphrey: *What* was that? What was that, Hodgekin?