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Any change in the urination habits of a dog can be a sign of serious illness. While not all increases of urination signify a deadly disease, it is important for the affected dog to see a veterinarian as soon as possible.
Urinary Tract Infection (UTI)
A UTI can affect any portion of the urinary tract, including the kidneys, ureters, urethra and the bladder. Infections include bacterial infections (pyelonephritis), leptospirosis and cystitis; all of which can cause increased urination.
Diabetes
An increase in urination can indicate canine diabetes, especially in dogs that are overweight or dogs on certain medications such as progestagens or glucocorticoids.
Cushing's Disease
Also known as hyperadrenocorticism, Cushing's disease can cause increased frequency of urination. Cushing's disease is a condition in which the body produces excessive levels of glucocorticoids.
Medications
Specific medications, such as corticosteroids and diuretics, can lead to increased urination; either due to toxicity to the liver or as a reaction to the drug.
Kidney Failure
Often, one of the first noticeable symptoms of kidney failure is frequent urination accompanied by an increase in thirst. Kidney failure can have a number of causes, including toxicity from prolonged medication use or reoccurring infection.
Source:
Pet Place: Chronic Renal (Kidney) Failure in Dogs
Pet Education: Cushing's Disease (Hyperadrenocorticism) in Dogs
More Information:
Dog Channel: Excessive Urination in Dogs
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