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This might mean that your dog asks to be let out more frequently. He may also be more insistent, as though every time is an emergency. Increased urgency is a tell-tale sign of UTI. You might also notice repeated urinating behavior (squatting or leg-cocking) without urination. The dog might feel like he or she needs to urinate, but be unable to urinate when let outside. This might be hard, as dogs usually urinate onto grass. If you suspect your dog might have a UTI, though, watch the urine stream mid-air, before it hits the ground. If it looks like it has blood in it, take the dog to the veterinarian immediately. Older dogs with heath issues like kidney disease or diabetes tend to drink more water to deal with their condition. This can lead to "subclinical infections" due to increased urination. There's bacteria present, but not enough to cause observable signs of discomfort.  The only way to test for a subclinical infection is having a vet test a urine sample. Some vets recommend doing this as part of older dogs' regular medical routines. If your dog has a history of subclinical infections, have its urine tested every three to six months. The "infection" part of UTI signals the presence of an infectious agent like bacteria. This needs medical treatment, so you need to take your pet to the vet as soon as possible. If you can, collect a sample of the dog's urine to take with you, as this may speed up the diagnosis. If you're taking steps to keep UTIs at bay, but your dog keeps getting them, they might be an underlying health problem. This problem may be weakening your dog's immune system or bladder tissue, resulting in increased UTIs. Identifying and treating the problem will reduce the chance of UTI. Ask your vet to run tests to identify potential causes for your dog's problems. This might include:  Blood tests: The vet can check for conditions that may make the dog drink more and have weaker urine (kidney, liver disease, diabetes) Imaging: An ultrasound can check for the presence of polyps, bladder cancer, bladder stones, and other issues which can affect the bladder lining. Urine sediment exam: The veterinarian urine sediment under a microscope for crystals that might explain the dog's issues.
Watch for increased urgency of urination. Look for blood in the urine. Have older dogs tested regularly. Take the dog to the vet if you suspect a UTI. Have a veterinarian address repeated infections.