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Hello, I'm Dr. Deb and will do my best to help you today.
I'm sorry for this concern for Marley but glad to hear that she's doing so well post-op. As you probably know, not all dogs who develop a pyometra will have such a happy outcome.
As to her increased thirst, if her kidney values were elevated prior to the surgery (which is commonly seen with pyometra dogs), then this could explain her thirst and urination issues; it's not uncommon in these patients. In most cases, permanent damage isn't done to the kidneys and the patient will return to normal after a period of time (which is different for every dog).
However, it's also possible that something else such as urinary tract infection has developed which might explain her behavior.
If a urinalysis hasn't been done and she were my patient, this is what I would suggest. I would want to insure that I wasn't missing anything and just assume that it was normal. It certainly might be...and probably is under the circumstances....but I wouldn't want to let a uti go undiagnosed nor untreated.
I hope this helps. Deb