The amount of food definitely depends on the dog's height, weight and build.
Honey (23 lbs 15 1/2 inches) gets 1/3rd twice a day
Oshie (26lbs 16 inches) gets 3/4ths twice a day
Ruutu (~36lbs 18 inches) get a cup twice a day
Ironically Oshie and Ruutu could afford to gain more weight as well, but it's hard to keep it on them. Honey got fat on me for a year and we found 1/3rd twice a day is perfect for her.
Just watch her weight as you play with her food amounts. I won't touch on free feeding since others have already, but like they said, not the best idea.
Honey (23 lbs 15 1/2 inches) gets 1/3rd twice a day
Oshie (26lbs 16 inches) gets 3/4ths twice a day
Ruutu (~36lbs 18 inches) get a cup twice a day
Ironically Oshie and Ruutu could afford to gain more weight as well, but it's hard to keep it on them. Honey got fat on me for a year and we found 1/3rd twice a day is perfect for her.
Just watch her weight as you play with her food amounts. I won't touch on free feeding since others have already, but like they said, not the best idea.

