My name is Deb and I am here with Doby, an 11 1/2 year old white shepherd/akitka mix (a giant breed; normal weight is 115). He started with increased panting and thirst this past summer, but we are in Arizona (the mountains, but still hot), and he's always panted. The Vet wanted to do the two pronged blood test for Cushing's and his initial numbers came back 6 before the Cortisol and 22 after the Cortisol. They started him on 60 mg of Vetroyl once in AM (he weighs 100 lbs) and Marvels two tablets twice a day. He's developed significant diarrhea. We have relocated to Tucson and his new Vet advised us to stop the Vetroyl for a few days and see if diarrhea improves. It has not. We are now titrating back on the Marvels--new Vet's second step. We are restarting the Vetroyl at 30 MG one time per day on Sunday (he hasn't had any Thurs, Fri or Sat)/ The new Vet feels like his initial dose of Vetroyl is super high. When he was tested after being on the Vetroyl for a month, his pre cortisol number was 1 and post was 6. I am wondering if the Marvels really do any good and if they could be causing the diarrhea. I also read your article about dosing Vetroyl for large dogs and shared it with the new Vet. Doby is also losing clumps of hair since he started the medications and has a lot of skin flaking. He also has a tumor on his heart (non-malignant--has not grown, which was DX when he was 5 years old). We know, as a giant breed, his days are numbered, but we want to be sure he stays as comfortable as possible. He still hikes a mile to a mile and a half every day and goes for an additional walk as his second walk. He's got a lot of pep in him for an old giant dog.