I have a lab who is now close to 10 years who for the first 7 years right from puppyhood always had urinary tract infections, high ph urine and crytals. 3 years ago I put her on Diamond dog food which has controlled levels of ash and I haven't had a problem since. Wish I could have known earlier that that is all she needed, in her case. You may also add 1 tsp Apple Cider Vinegar to a pint of water for the drinking water. Works for pet birds too. Hope all this helps. Science diet didn't work for me, just to let you know.