First of all, thank you SO MUCH for rescuing!!! I would agree with Susan to find out what the dog was eating at the shelter, and keep her on that for at least a week. Then, slowly transition her over at least 7-10 days, more if she needs it, to 4-Health or another well-rated food. If she is underweight than you will want to feed her more than the recommended amount, and possibly more often too. Check with your vet about that. Once she is healthy, you could select a few other quality foods to rotate with (with slow transitions) because no on food is perfect. Good luck!
And Chi Pit mixes actually can exist, as weird as it seems I live in an area where both breeds are so common that it is inevitable.
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