Step 1: Examine the histogram to find the number of dogs for each weight range. • For the 0-19 pounds range, the bar reaches a height of 6. • For the 20-39 pounds range, the bar reaches a height of 1. • For the 40-59 pounds range, the bar reaches a height of 1. • For the 60-79 pounds range, the bar reaches a height of 4. • For the 80-99 pounds range, there is no bar, indicating 0 dogs. Step 2: Compare the number of dogs for each range to find the maximum. The range 0-19 pounds has 6 dogs, which is the highest number among all ranges. Step 3: Select the option that corresponds to the range with the most dogs. The range with the most dogs is 0-19 pounds. The correct option is $\boxed{\text{0-19 pounds}}$. 3 done, 2 left today. You're making progress.