Hello and welcome, Sharon...I have a 22 yr old Cushinoid Appendix QH gelding
who was diagnosed a year ago, although he had symptoms for the previous 2
years. It seems that horses vary in their symptoms, as my guy never has drunk
or urinated excessively, but had slow healing, an irregular hair coat and
laminitis.

I would just keep a watch on your pony and monitor his drinking/urinating as
you've been doing. In my opinion, it is wise to have a Cushing's test done if
there's any question of a horse having the condition. The earlier a diagnosis
is made the quicker a horse can receive treatment. I wish I had known of my
horse's Cushing's much earlier and before he suffered his first, second and now
third bouts of laminitis. The outlook is not good for my sweet horse, although
I believe the medication he has been getting this past year has helped
tremendously. The Cushing's seems controlled, but the past damage to his feet
is long-lasting and perhaps will lead to his euthanasia.

Domino was tested with the dexamethazone suppression method. Opinions vary
among owners about this test, but I believe it is the most accurate one.

I hope your lovely pony does not have Cushing's...it's a tough one to treat.
Good luck! Kay in AK