I have 2 cats I recently adopted, both about 8 months old. How much wet and dry food should I be feeding them and at what age should I start transitioning them to adult dry food? Right now I am giving them a quarter can of wet food twice a day and then I leave out dry food for them. My guess is that I should be giving them a measured amount of dry food so they don't eat too much of it, but how much? Thanks!