New Diagnosis 7 yr old Jenna

[J@ke]

Our 7 yr old lab/shepherd mix was just diagnosed with cushings earlier this week. We already have another dog with EPI so are quite familiar with complicated treatment that is a trial and error process to dial in.

Jenna is currently 96 lbs after being 83 lb 6 months ago. Vet initially tested for hypothyroidism which came back negative and then tested for cushings which was positive. Vet wants to start her on 60mg Vetoryl 1x per day. Some posts I've seen make it seem like that is high to start out at but it seems within the dosing range recommended. It makes sense to me to start lower and work our way up as needed but having a hard time understanding what's really recommended as a starting point. Is there somewhere I should be going to get the right information?

Jenna's test results:

Alkaline Phosphatase (ALKP)
Lab results:702.000 U/L
Lab range:23.000 - 212.000 U/L

ALT/SGPT (ALT)
Lab results:198.000 U/L
Lab range:10.000 - 125.000 U/L

Cortisol Sample 1
Lab results: 4.9 ug/dL
Lab range:1.000 - 5.000 ug/dL

Cortisol Sample 2 Dex
Lab results:0.6 ug/dL
Lab range:0.000 - 1.400 ug/dL

Cortisol Sample 3 Dex
Lab results:1.6 ug/dL
Lab range:0.000 - 1.400 ug/dL

Thanks!