Our daughter Fiona and her husband came up from Abbingdon with their dog, a Labrador puppy called Cooper. We introduced him carefully in our house and let him meet the Siamese ladies. Jayne wasn't pleased and left the room for a quiet place, but Lex was very interested and followed Cooper around. No arched back or bottle brush tail or hissing. They even came nose to nose and Lex was sitting there very confident. So far, so good.