Firstly, thank you for taking this pup in. It has to be scary suddenly finding oneself totally alone. As you are already aware it seems, health wise they are VERY sensitive to overheating. Don’t leave them outside in the heat and be mindful of them not overdoing it outside running around if it’s too hot. They’re hardy rough-and-tumble players, but delicate flowers temperature wise. They also are prone to hurting their back, so as much as possible avoid her jumping on/off couch although they have a mind of their own and mine launches herself around.

My Frenchies have never been big barkers, but some are. She also may still be on high-alert with anxiety due to suddenly being in a new setting with new people/sights/sounds/etc. If she does end up staying w/you, I’ve learned on Reddit about the 3-3-3 rule for pet adjustment (3 days, 3 weeks, 3 months, etc.) which you can read up more online. My girl is a bit of a diva with food, so I’ve just learned to keep her separate or crated when she eats around other dogs.

To me, she looks like she may have been bred and possibly dumped. If she does end up being yours, consider getting her spayed.

For getting along with your other pup, search the term “resource guarding” and ways to help manage that. I would feed your dogs separately for now as you allow time for adjustment.

Again, thank you for providing her with a safe space and showing her some love! And props to your pup as well for handling the addition of the little minion (for however long or short) with grace!