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In reply to the discussion: I need some advice from people who are cat savvy (UPDATED WITH PICTURES) [View all]Curmudgeoness
(18,219 posts)My cat, Sammy, insisted it was past bed time, and of course he was right.
But I did think a little more about this. The cat you have partially adopted already will do fine indoors. If she is pregnant, I really do wish that you would bring her in before she gives birth. Even if you have a spare bathroom or a garage for her to be in while you make sure that she will be a good pet, that will give her some place safe to have her litter.
I don't know why she insists on hanging out on your porch, but some might say that she chose you....for some reason that you cannot know at this time. You say your dog is 12 years old. Maybe Nikita is there so you will not be alone one day. I don't really buy into things like this, but there are lots of stories like this.
Take her to the vet as soon as you can, and if you can't pick her up yet, invite her in and find a place to isolate her until you can. I would not be surprised that you can't pet her and get her used to you touching her while she is eating. Or sit so you make a lap and hold treats or food so she has to jump up on you to get it. But I really would be concerned about her having kittens outside.