Yes, I do....my first Rottweiler had Cushings Disease. Drinking large amounts of water and then he started to have accidents with huge amounts of urine in the house at the age of 9 was what made me investigate what was going on further. They will do a series of blood tests to see like ACTH stim tests to see if your dog has Cushings. https://www.vetsecure.com/natomasamc.com/articles/211
My dog had a lot of muscle wasting and weight loss with his Cushings. He had the pot belly for a short amount of time. Cushings can have a lot of vague symptoms that seem strange when looked at individually. But when the dog is diagnosed as a Cushings dog...then the symptoms all make sense. Cushings can be a very difficult disease to manage...it was for us. Good luck. I really hope your dog doesn't have Cushings.