Hello, my Harry had a urinary blockage last September (he's 6 years old), and had to be catheterized (sp?) to remove the crystals. Ever since, he has been on a diet of prescription dry food free fed (I alternate between Hills c/s and Waltham o/d), and Fancy Feast for wet food once per day (it's the only wet food he'll eat!). Is there a better diet that will help to assure that he doesn't have a reoccurence of crystal blockage? Has anybody's cat had this problem without a reoccurence? Thanks in advance for information!