welcome to the forum Ava.
So... Who's the new girl and what sort of puppy have you got. Many congrats on both fronts.
I'm not big on caging or even tethering dogs. Do appreciate though that you may have a conundrum over your dog seeing your new girl as a large chew toy.
Good luck with that combination and as I say, big welcome to the forum
All the best,
Shamus.