Get 4 Free Pet Insurance Quotes. Urinary tract infections (UTIs) occur when bacteria colonize areas of the urinary tract that should be sterile. Normally, the bodies of dogs and cats naturally help prevent bacteria from adhering to and multiplying in the urinary tract. Keep the urine acid up. If ... Keep the arthritis at bay. Keep the immune system up. • Foods that are known to aggravate UTIs include asparagus, spinach, raw carrots, tomatoes, and dairy products. • Supplementation with B vitamins and antioxidants in times of stress, as well as offering cooling foods such as raw fruits, vegetables, and yogurt to reduce the symptoms of urinary tract infection. Great food also helps build a strong immune system so that the body can recognize problems in the bladder sooner. Add one teaspoon (for small dogs) or 1-2 tablespoons (for big dogs) of apple cider vinegar to your dog’s water bowl. The best way to do that is with food based on meat, as many as a great source of acid.