If you have ever experienced a urinary tract infection (UTI), you know how painful and uncomfortable it can be. But did you know that dogs can also get UTIs? In fact, UTIs are common in dogs, especially in older dogs and certain breeds that are prone to urinary tract stones. A UTI is an infection caused by bacteria that enter the urinary tract through the urethra and multiply in the bladder or kidneys. UTIs can affect any part of the urinary system, but they are more common in the lower urinary tract (bladder and urethra).