As a feline vet, I have researched nutrition for many years. The scientific evidence is OVERWHELMING that wet food is far better for cats than dry food. It is much closer to what nature intended, and helps avoid lots and lots of problems. Here is a partial list of diseases related to diet:
* Hepatic Lipidosis (Liver Failure)
* Heart Disease
* Inflammatory Bowel Disease
* Chronic Renal Failure
* Lower Urinary Tract Disease
* High Blood Pressure
* Viral Conjunctivitis
* Skin and Coat Problems
All of these (except possibly thyroid disease) are seen most commonly in cats eating dry food, and most can also be solved by converting to a wet diet.
If people would rather spend their money for vet bills than on healthy food, that's fine--just realize it's going to cost one way or the other, but only one involves suffering for the cat. I admit, I'm getting crankier about this as time goes on...because I see so much damage done by dry food. Dry food has 2 advantages: it is cheap and it is convenient. But those are not benefits to the cat, are they?
To be clear, canned and dry foods are not nutritionally equivalent. Dry cat food is typically around 30-35% protein, wet food is 45-50%. Dry food usually has around 30-40% carbohydrates, wet food around 10%. Feline physiology uses protein and fat for energy, so carbs are mostly excreted or stored as fat. The most important nutrient, water, is present at 10% in dry food, but nearly 80% in canned.
Okay, I'll get off my soap box now, but will leave you with this: http://www.littlebigcat.com/index.php?a ... cannedfood