S1·E20 The Bow-Wow Affair

Waverly's cousin is killed by his own dog when he refuses to sell his stock to a gypsy named Delgrovia (Paul Lambert), so Illya investigates and, with the help of Ursula (Susan Oliver) and dog expert Guido Panzini (Pat Harrington Jr.), traces two of the dogs to Delgrovia's estate, where he and Ursula are soon cornered by a pack of deadly Doberman pinschers.