You have a point, Jack would make a good dog too. Maybe something in between? A rabbit? It's energetic, cuddly and shags a lot. And I can see Ianto being a cat person. I'd like to recommend this great fic in which Ianto and Jack get turned into a dog and cat respectively. The idea sounds cracky and silly but the fic is great (it also has awesome Gwen/Rhys). http://www.whofic.com/series.php?seriesid=1642

Yes to Owen with a Jayne-cap! I really want to see this! And do you think he names his scalpels?