Hi and welcome to you and Marcie!

Welcome back and congratulations on the new addition to your family, Marcie is blessed to have you as her pet parent! Also, I am so sorry for the passing of sweet Fraser, my heart goes out to you.

The test I would recommend for Cushing's is the ACTH stimulation because of Marcie's other health issues as it is preferred when a dog has any underlying health problems.

It would help us greatly if you would post all abnormal blood Chemistry/CBC levels for us, I did see that you said her liver enzymes were elevated, could you post which one/s and how high?

Sorry this is so short and I'll try to get back later.

Hugs, Lori