Ambrosius

Ambrosius, Sir Didymus's semi-faithful steed, is a dog who closely resembles Sarah's own dog. He has much more sense than his enthusiastic master, and knows when to run away from trouble, which usually leads to Didymus chiding him.

The Ambrosius puppet was used in close-ups, while a real dog was used in full-body shots.

Ambrosius's voice was provided by Percy Edwards.