Three dogs--a Pekingese named Sun-Yat Sen owned by Henry Sleeper Harper; a Pomeranian owned by Margaret Hays, and another Pomeranian owned by Elizabeth B. Rothschild. The Rothschild dog was then attacked and killed by a larger dog within just a few weeks of surviving Titanic.
The story of Riegel or Rigel seems to have been a press invention, one among many. I have run across several versions even in fairly reputable magazines of the day - and some unlikely ones like "Good Housekeeping," of all places.
A bit of Titanic doggie trivia:
We've all heard stories (some apocrychal) of people who missed sailing on Titanic, but there was at least one pup who missed the boat of boats. Lady Duff Gordon's Pekingese Mr. Futze ("Footsie")always accompanied his mistress on trips but in April 1912 she reluctantly left him back at her Paris flat, looked after by her maid Rachel, because she was making only a quick business jaunt to NY and thought "Footsie" would have a better time "running about the garden or begging at the tea table."
One has few doubts, however, that had Footsie been aboard Titanic, he would surely have escaped on milady's lap, putting the number of occupants of the embattled emergency boat up to 13, an extra bit of bad luck the Duff Gordons surely did not need.
The New York Herald attributes the Rigel story to one Jonas Briggs, a crewman on Carpathia. Trouble is, there was no Jonas Briggs in her crew, as you can see on this site. Rigel was supposed to belong to William Murdoch.
One of my favourites is the press story that turned Edith Russell's musical box in the form of a pig into a real pig. Fancy saving a pig at the expense of humans!
Sandro, we've had the discussion on ET twice that I know of concerning where the kennels were. Since I don't recall where the thread is, all I can do is sum up by saying that nobody seems to know for sure where they were. The deck plans reproduced in Eaton & Haas "Titanic, Triumph and Tragedy place the kennels on F deck just across the passageway from the 3rd Class Galley.
While I don't think this can be 100% ruled out, I suspect this may not have been the case if only because of the obvious health and sanitation problems this would tend to cause. A likelier candidate seems to me the Boat Deck IMO. It wouldn't have been too much trouble to convert a deck chair stowage over for that perpose at the last minute.
Of course, I could be mistaken on this. If anybody has better information, I'd be glad to hear it.