"I know that there are commercially available permanent-puppies - although it's cosmetic; I think they develop adult personalities insofar as dogs have personalities - but I'm not sure if I've ever seen a permanent kitten, perhaps simply because people are disinclined to walk them. I'd be astonished if the kitten tree produced non-seedless creatures, anyway, that would be the sort of thing that would get one marked down at a Bioestheties competition. Smacks of lack of control over the product."