How many times a day do you feed your pets?

I've met a handful of people that say they only feed their dog once a day. This seems odd to me, but I don't have pets so I never said anything.

I just know that even if I ate my daily caloric intake of 2,300 calories a day once in the morning, I would still be hungry later in the day.

That's mainly why we split up meals as humans. Is it not the same for pets? Does anyone feed them 3 times a day?