When our two guys were puppies, we fed them 1 cup 3 times a day, 1 cup in the morning, 1 cup in the afternoon, and 1 cup in the evening. When they were 7 months old, we switched them to adult food, and also reduced their kibble to 1 cup, twice a day. They are 21 months old now, and we continue to feed them twice a day. Every dog, and every bully is different though, and some people do feed once a day, and it does work for them, sometimes it's the dogs personality or preference, and sometimes it's what works best for your work schedule. Feeding our guys 2 equal servings twice a day works for us, because there is usually always someone home, and our guys tend to inhale their food rather than chew it, so a smaller amount is better for their stomach and digestion, plus they would be starving by the morning, if they only ate once. If it works for you and Marley, then it should be okay.