If Ella's dog eats 4 pounds of food for every one pound of food that Ella eats, when Ella eats 20 pounds of food in a day, Ella's dog eats 4*20 = <<4*20=80>>80 pounds of food.
Together, in one day, Ella and her dog eats 80+20 = <<80+20=100>>100 pounds
In 10 days, Ella and her dog will eat 10*100 = <<10*100=1000>>1000 pounds of food.
#### 1000