I adopted Missy 5 months ago - she's about a year old. I already owned another cat, about 3 years old. Our vet recommended we feed the 2 cats separately (in different rooms) to prevent one cat from over-eating, and the other from not getting his fair share. I was told to feed them for 15 minutes 2-3 times a day, which we've been doing for 5 months now. Our older cat has adapted well to this, but Missy (the newest cat) is always hungry! Her constant meowing and begging is completely driving us nuts! We gave in over the weekend and left their food out all day/night long. We are finally getting the peace & quiet, but now Missy is over-eating and vomitting! They eat good dry food - prescription Science Diet d/t. Any suggestions?