Change over from dry food to wet?

It isn't just that you are giving wet food, it is because they are getting a better quality food. Purina is crap food. You have to look at the ingredients of the food. Cats are carnivores not omnivores. Yet most foods contain mostly grains (a little grain is ok), which they can't digest properly. With those foods they aren't getting the nutrition they need and their coat isn't as good. So they shed more and have more hair they throw up. I feed my cats Innova Evo food. It is mostly meat and animal products. I feed them both hard and canned food, and they have the best coat imaginable and never throw up. I also squirt some salmon oil on their wet food which helps their coat as well. I would suggest trying it and seeing an even greater difference. If you are going to have a pet you need to give them what they need even if it costs a little more. They will live healthier and longer.