Owners of dogs with Cushing’s become expert observers. They track water intake, notice coat changes, register every shift in appetite and panting. These are the signs the disease makes visible, and watching them closely is genuinely useful.
The trouble is that the clinically significant consequences of chronic cortisol excess are largely the ones you cannot observe at home. Systemic hypertension and protein loss through the kidneys produce no symptoms an owner can see — until enough damage has accumulated to produce symptoms of its own. They are measured, not noticed.
Hypertension Is the Rule, Not the Complication
Systemic hypertension is common in dogs with hyperadrenocorticism — reported in a majority of cases, with figures across the veterinary literature frequently cited in the region of 50 to 80 percent depending on the population studied and the measurement protocol used.
The mechanisms are several and reinforce one another. Cortisol increases the sensitivity of blood vessels to circulating catecholamines, so the same adrenergic signal produces more constriction. It has direct effects on sodium and water handling, expanding circulating volume. And activation of the renin–angiotensin–aldosterone system contributes further.
What makes this clinically important is that the dog will not tell you. Hypertension in dogs is silent until it is not. The organs that absorb the damage — kidneys, eyes, heart, brain — do so quietly, and the first visible sign can be a sudden and serious one: acute retinal detachment and blindness, or a neurological event.
Blood pressure measurement is not a routine part of every Cushing’s recheck in every practice. It is reasonable to ask whether your dog’s has been measured, and what it was.
Proteinuria: The Kidneys Under Load
Protein in the urine is the second silent finding, and it frequently accompanies the first.
Healthy kidneys retain protein. When the glomerular filtration barrier is stressed — by elevated blood pressure, by the metabolic effects of chronic cortisol excess, or by both together — protein begins to escape into the urine. Persistent proteinuria is not merely a marker of kidney stress; it is understood to contribute to ongoing kidney injury itself, which makes it a target for treatment rather than simply an observation to record.
The measurement that matters is the urine protein-to-creatinine ratio (UPC), which quantifies protein loss in a way a standard urine dipstick cannot. Interpreting it requires context: an active urinary tract infection will elevate it independently, and dogs with Cushing’s are already predisposed to urinary tract infections — often without the straining or discomfort that would normally alert an owner. So a UPC is properly interpreted alongside a urine culture, not in isolation.
Why Cushing’s Dogs Get Silent Urinary Tract Infections
This deserves its own note, because it surprises people. Cortisol is immunosuppressive. Dogs with hyperadrenocorticism are more susceptible to urinary tract infections and simultaneously less likely to display the classic signs — the inflammation that produces discomfort and urgency is itself blunted.
The result is a meaningful population of Cushing’s dogs carrying an infection nobody has detected, in an animal already producing large volumes of dilute urine that makes the picture harder to read. Periodic urine culture, not just urinalysis, is how these are found.
What Monitoring Should Actually Include
Effective monitoring for a Cushing’s dog extends beyond confirming that cortisol is controlled. A reasonable ongoing picture includes:
Blood pressure measurement at diagnosis and periodically thereafter — ideally with a consistent protocol, since a single reading in an anxious dog in an unfamiliar room is easy to misinterpret.
Urine protein-to-creatinine ratio, interpreted alongside urine culture rather than assumed to reflect kidney injury alone.
Routine urine culture, given the elevated risk of clinically silent infection.
Standard biochemistry and complete blood count, watching kidney values, liver enzymes, and electrolytes over time rather than as isolated snapshots.
The trend across visits is more informative than any individual result.
Does Treating the Cushing’s Fix It?
Partly, and not always completely.
Controlling cortisol addresses the driver, and blood pressure often improves as a result. But hypertension does not reliably resolve on cortisol control alone, and a proportion of dogs need specific antihypertensive therapy alongside their Cushing’s treatment. Similarly, proteinuria may improve as cortisol comes down while still warranting its own management.
This is why blood pressure and UPC are worth measuring *again* after cortisol control is established, rather than being treated as diagnostic-stage questions already answered. A dog whose cortisol is well controlled can still be hypertensive.
For owners exploring adjunct natural support, the relevant point is that none of it substitutes for this monitoring. Whatever else is in the plan, the blood pressure cuff and the urine sample remain the instruments that detect the damage nobody can see. Background on the research behind lignans and melatonin is available at lignans.com.
The Bottom Line
The visible signs of Cushing’s — thirst, appetite, coat, panting — are not the ones doing the lasting harm. Hypertension affects most dogs with the disease, proteinuria is common, and silent urinary tract infections are frequent. All three are found only by measuring. Ask your veterinarian whether your dog’s blood pressure and urine protein have been checked, and whether they have been rechecked since cortisol control was achieved.
Sources
- Merck Veterinary Manual — Cushing Disease (Pituitary-Dependent Hyperadrenocorticism) in Animals. https://www.merckvetmanual.com/endocrine-system/the-pituitary-gland/cushing-disease-pituitary-dependent-hyperadrenocorticism-in-animals
- Merck Veterinary Manual — Systemic Hypertension in Animals. https://www.merckvetmanual.com/circulatory-system/various-cardiovascular-diseases-in-dogs-and-cats/systemic-and-pulmonary-hypertension-in-dogs-and-cats
