This excerpt from Katherine Force's personal papers (as recorded by Dr. Kimball) has appeared online in several places and gives some insight into the Astor's pet airdale while onboard.
“The Astor party. . . included Kitty, Colonel Astor’s favorite Airedale terrier, that had traveled all over the world with him. The two were inseparable companions for years, and . . pathetically Mrs. Astor told of how Kitty got lost in Egypt on the trip up the Nile. She wandered away form Colonel Astor’s side one day at a landing and [he] was greatly distressed by the loss of the dog. He spent a great deal of time looking for her, and when he had to give up and start [sailing] up the Nile again he employed scores of natives to look for her, promising a handsome reward for her return. Nothing was heard of Kitty until on the return trip [downriver] when on passing another dahabea [boat]. Colonel Astor spotted Kitty making herself at home on board. The Astor boat was stopped and Kitty found her master with joyous barks. After that, a closer watch was kept of Kitty on board the Titanic. She slept in Colonel Astor’s room. Colonel and Mrs. Astor took frequent walks and he romped with Kitty a great deal.'