Judith, can you give me a timeline for Bryg's symptoms, please? Is or were her anorexia, polydipsia (increased thirst), inability to stand on her hind legs, and bruising on her hind legs present concurrently?
Anorexia is a non specific sign of illness.
Polydipsia and urinating a higher volume of urine (polyuria) are danger signs for quite a few disorders. These include both hepatic and renal insufficiencies, urinary tract infection involving the kidneys, diabetes mellitus and Cushing's disease (both will also cause increased hunger (polyphagia), pyometra (infected uterus if she's unspayed), hypercalcemia (increased serum calcium level), electrolyte (sodium, potassium, chloride) imbalances, and the rarer Addison's disease, diabetes insipidus, and brain tumor involving the hypothalamus.
Inability to stand on the hind legs can represent a general weakness, pain in doing so, myelopathy (spinal cord disorder), or encephalopathy (brain disorder).
Bruising (petechiae and ecchymosis) reflects platelet, vascular, or von Willebrand factor disorder. Given that an underlying cause of disease may be associated, a complete history and physical examination are essential to help deterimine the diagnosis and treatment. It's hard to imagine that such a constellation of signs would be accompanied by normal labs. I need to consider that something was missed in those labs or labs that should have been performed weren't. Can you upload a copy of Bryg's test results to our conversation? I understand that you might not have a copy at home but her vet can give you one which you can scan into your computer and then give me the file link or you can photograph the pages and upload them by using the paperclip icon (if you can see that icon) or by using an external app such as dropbox.com/