Hi Joan,
Glad that you've finally got a diagnosis for Gable and sorry it's Cushing's, but you are definitely armed with much more knowledge and experience now and I know you'll do well in treating your precious boy.
I'm just a bit hesitant with the 60 mg starting dose, even though that's a reasonable dose for Gable's weight of 76.4 lbs the study regarding that larger dogs may require smaller amounts of Trilostane per day keeps resonating in my mind, we've also seen that here on the forum. If this were me, I would start out at 40 mg instead...this is just my opinion. Either way I know you will do great!
Hugs, Lori