Both these types of food have almost the same amount of nutrition, the best difference is that dry food is better for the cat's teeth as it has less moisture.

Yes, it is recommended to feed your cats a mixture of dry and wet food. The reason being that the high amount of water content can increase the rate of urination, so the use of dry food can help in controlling that frequency, thereby maintaining their urinary tract. It has been found that a moisture-rich diet can decrease weight and a combination o

Yes, if dry food sits open to the air for more than a couple of days it can go bad. Keeping it open exposes it to moisture, which can damage the quality of the food.