Senior dog keeps getting UTIs? Three or more infections in 12 months counts as recurrent. The common causes, how vets find them with a urine culture, and what helps at home.
A urinary tract infection (UTI) in a senior dog usually shows up as frequent small pees, straining, blood in the urine or new accidents in the house. If the infection keeps coming back, vets call it a recurrent UTI: under the ISCAID guidelines, that means 3 or more infections in 12 months. A recurrent UTI almost always has a reason behind it, such as bladder stones, incontinence, diabetes, Cushing's disease or kidney disease, and a urine culture is the key test to find the right treatment.
1. Peeing often, in small amounts. 2. Straining or taking a long time to pee. 3. Blood in the urine or a strong smell. 4. Accidents in a dog who was house-trained. 5. Licking the genital area more than usual.
Some senior dogs show few signs at all, which is one reason routine urine checks at senior visits are useful.
Cornell University's Riney Canine Health Center lists these risk factors for recurrent infections:
Treating the infection alone without finding the cause is the most common reason it returns.
Relapse or reinfection?
Vets separate two patterns. A relapse is the same bacteria coming back within about 6 months, which suggests the first infection was never fully cleared. A reinfection is a different bacteria, which points to something that keeps letting bacteria in. Your vet can only tell the difference with a urine culture each time.
1. Urine culture and sensitivity. A culture identifies the exact bacteria and which antibiotics will work. It is considered the gold standard, ideally from a sample taken straight from the bladder with a needle (cystocentesis). 2. Urinalysis. Checks for crystals, sugar, blood and urine concentration. 3. Blood work. Looks for kidney disease, diabetes and Cushing's disease. 4. Imaging. X-rays or ultrasound look for stones, polyps or masses. 5. Treatment based on the culture, not guesswork, and a recheck after treatment if your vet advises it.
Do cranberry supplements prevent UTIs in dogs?
The ISCAID guidelines say there is not enough evidence to recommend cranberry extract, urinary antiseptics or long-term low-dose antibiotics to prevent UTIs. Ask your vet before adding any supplement, and never use leftover antibiotics.
Go to a vet right away if your dog is straining and little or no urine comes out, keeps trying to pee without success, is vomiting, very tired or seems painful in the belly. A blocked bladder can be life-threatening.
Three or more infections in 12 months meets the ISCAID definition of recurrent UTI. Even two close together is worth a full workup with your vet.
Yes. Bacteria can show up in urine without signs. Your vet will decide whether it needs treatment; often it does not.
Common reasons include incontinence, a hooded vulva, skin folds and bladder stones. A culture, urinalysis and imaging help find the cause.
Some bladder stones can be managed with prescription diets. Only use one your vet recommends for your dog's stone type.
Sources: Cornell Riney Canine Health Center: Urinary Tract Infections, ISCAID guideline update (VIN), Today's Veterinary Practice: recurrent UTI.
Related guides: Old dog peeing in the house suddenly, Managing senior dog incontinence with pads and diapers, Senior dog drinking a lot of water.
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