The martian felines look a lot like cornish rexes, but they must have totally different physiologies to be able to exist in such a cold climate with absolutely no oxygen in the atmosphere. Cats on earth are desert-adapted. That's why the feral cat population in Australia has been so successful. But these cats could conceivably be used to populate Antarctica and rid us of that pesky penguin infestation.
I remember reading the famous Space Cat novels as a child. In Space Cat Meets Mars, Space Cat actually encounters another cat on Mars, and she turns out to be genetically compatible with him, because in the next book, they have kittens together. I thought that was all a bit farfetched, but it seems I was mistaken.