We used to set out a dish of dog food for Arlo and Greta, and made sure it always had food in it. They self-regulated well, and we didn't have to worry about them overeating. Then Greta doubled her width.
For about 5 months, I've measure out their food in the morning and after our dinner. They eat it, and wait for the next meal.
This week, I've noticed they weren't eating. I was starting to get concerned.
I got out of the shower this morning and heard *plink plink* Hmmm... I peeked around the corner to find Henry carrying the measuring cup to the dish with 5 pieces of dog food. He repeated this four times before I let him know he was being watched.
So, they've been eating what I've set out, and what I've seen as "leftovers" were just Henry's handouts.