Excessive drinking in older corgi
First off this is an otherwise healthy dog who has had isolated health issues in the past including a near death experience following ingestion of rat poison, which was 5 years ago. In the last 6 months one of our 10 year old corgis has started drinking an unbelievable amount of water. She stands and drinks so long that it is noticeable. Obviously her output has also increased with input to the point where she used to be happy to pee 3 times a day (although offered many more opportunities) to needing to go outside every 30 minutes unless she is in her crate.
I am aware this sounds like a UTI and at first it was. She was seen by the vet and did a double round of antibiotics because the drinking symptom persisted. Her urine is now fine. She has also been tested for Addison's and Cushings both of which she does not have. It has gotten to the point that we speak to the vet multiple times a week, drop off urine at least once a week and she is seen around once every 2 weeks. Obviously this method is VERY cost effective, ha.
As such we are all pretty obviously stumped. Her sense of urgency that came with the UTI is gone but she will simply go into another room and pee if not let out consistently. So at this point suggestions from the peanut gallery are welcome!