Dog Drinking Lots of Water in San Jose — What It Could Mean

How much water is too much

A normal dog drinks about 1 ounce of water per pound per day (so a 50 lb dog drinks about 50 oz). If you are refilling the bowl noticeably more than usual, your dog is asking to go out at night, having accidents, or you can pour water into the bowl and watch it disappear, that is increased thirst (polydipsia) and worth a vet visit. The change is usually more important than the exact volume.

The big four causes we test for

Diabetes mellitus (high blood sugar — also causes weight loss and increased appetite). Cushing's disease (overactive adrenal glands — also causes pot-belly, hair thinning, panting). Kidney disease (also causes weight loss, decreased appetite, sometimes vomiting). Urinary tract infection (especially in older female dogs — also causes straining, accidents, blood in urine). All four are diagnosable with bloodwork and urinalysis at the first visit.

Less common but important

Liver disease, Addison's disease, high blood calcium (sometimes from cancer), pyometra (uterine infection in unspayed females — a true emergency), and certain medications (steroids, diuretics) all cause increased thirst. We screen for these on the same blood panel.

What the visit looks like

We start with an exam, a focused history (when did it start, any other changes, what medications), and a fresh urine sample if you can bring one. Standard workup is a CBC, a chemistry panel, a urinalysis, and often a urine culture. Specific cases may need an abdominal ultrasound, blood pressure check, or specialized hormone testing. Most dogs leave with a clear answer or a clear next step the same day.

What you can do before the visit

Measure water intake for 24 hours if you can — fill the bowl with a known amount, measure what is left in the morning, and write it down. Note any other changes (appetite, weight, accidents, energy). If you have an unspayed female dog drinking more, with a swollen belly or any vaginal discharge, do not wait — that is a same-day visit for possible pyometra.

Walk in or schedule

Increased thirst is usually an urgent (not emergency) workup unless your dog is also vomiting, lethargic, or an unspayed female with abdominal swelling. Call ArchVet Winchester at (669) 230-5034 to schedule, or walk in during open hours (until 10 PM daily). South San Jose handles scheduled diagnostic visits Tue through Sun.

Advanced veterinary care in San Jose

ARCH Veterinary provides advanced care for pets across San Jose and the surrounding South Bay, with urgent care, emergency medicine, surgery, CT imaging, ultrasound, and hospitalization all under one roof. Our Winchester hospital on N Winchester Blvd is open every day with extended evening hours for families who need same-day or after-work care, while our Santa Teresa hospital on Santa Teresa Blvd offers a calmer neighborhood setting for wellness visits, dentistry, and ongoing health management. Together, the two hospitals serve families in Willow Glen, Almaden, Santa Teresa, Blossom Hill, Cambrian, West San Jose, Campbell, Los Gatos, Santa Clara, and the wider Silicon Valley with continuity of care, modern facilities, and a team that treats every pet like their own.

Frequently asked questions

How much water should a dog drink per day?

About 1 ounce per pound of body weight per day. Big increases above this baseline are worth a vet visit.

What are the most common causes of increased thirst?

Diabetes, Cushing's disease, kidney disease, and urinary tract infections — in that rough order. All four are diagnosable with bloodwork and urinalysis.

Is increased thirst an emergency?

Usually urgent rather than emergency, unless your dog is also vomiting, lethargic, or an unspayed female with abdominal swelling (pyometra).

What should I bring to the visit?

A fresh urine sample if you can collect one, plus notes on when the change started and any other symptoms.