Not true. They're opportunists which means they will eat whenever they get the chance
Absolutely true, generally. Their environment drastically effects their food intake more than anything else, and you can certainly over-feed them, but they'll upchuck just as fast as they take it if they decide against it.
1.0 Josiah - Super Pastel het SK Axanthic
0.1 Abigail - Spider het SK Axanthic
1.0 Moqui - Pug - Rescued from a Meth lab
1.0 Winston - Min-Pin, Chihuahua, Dachshund mix, rescue
1.0 Buddha - Gray Tabby - baby of a neighborhood stray we took in
1.0 Precious(like the ring) - Siamese - Sister to above