I have a 7 month old kitten and he weighs 5.2 lbs. I give him the wellness kitten wet food and the feeding instruction says feed about 2/3 can per pound of body weight per day. Does that mean I have to give him 3 cans a day? I also have the Rachael Ray's Nutrish dry food. Would I be able to mix some of that with the wet food? And how much do I give?