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Hello, this is Dr. Jess. I am sorry to hear about your dog. If you did not get him into a vet last night, I would highly recommend getting him in ASAP. My concern given his history is that he could be going into an Addisonian crisis, which can be very dangerous. We can see dogs with weakness and collapse in these cases, which is sounds like your dog may be experiencing, so it would be best to play it safe and get him in for treatment (usually aggressive fluid therapy and sometimes treatment for increased potassium and decreased glucose).