Will Falconer, DVM Moderator
Hi Carol,
Some perspective is in order here. First, crystals are formed from eating dry food, something no cat should be fed, ideally.
As to percentages, you're asking a lumper, so I don't know. What percentage of prey is protein? Doesn't matter to me. I know it's real food and useful in this disease and most others, for that matter. Canned is better than dry, but it should be a healthy brand, no byproducts or unidentified species ingredients.
Don't worry about too much protein was the point of this article. Feed healthy protein, as close to prey as you can make it, and you should see benefits.