In general, dry pet food is always going to contain ash content (aim for something under 8%) while wet food will occasionally have it too, in smaller amounts (typically 2% or less).Click to see full answer. In this way, what ingredient in cat food causes crystals in urine?Struvite crystals are microscopic crystals that are found in the urine of some cats. Struvite specifically is a material that is composed of magnesium, ammonium, and phosphate. The crystals themselves can be perfectly normal but become problematic when they combine to form grit or stones of varying shapes and sizes.Also Know, does Ash in cat food cause crystals? Crude ash content listed on the packaging of any cat food refers to the total number of minerals. Later, it was determined that only magnesium–one particular mineral in that ash content–was responsible. “It turns out that struvite crystals form stones and block the urethra,” Carey explains. People also ask, what does low ash in cat food mean? Our low ash chicken meal consists of chicken meat and some accompanying bone, and “ash” denotes the amount of bone that’s ground into the meal. A low ash content signifies a higher grade meal due to more protein included and less bone.What cat food is best for urinary health? Our Top Picks Best Overall: Royal Canin Veterinary Diet Urinary SO Cat Food at Chewy. Best Dry: Wysong Uretic Dry Cat Food at Amazon. Best Canned: Hill’s Prescription Diet c/d Urinary Care Cat Food at Chewy. Best for Seniors: Blue Buffalo Urinary Care Cat Food at Chewy.