Answer: Option A
Explanation:
Option A is better statement, a positive one, it is not good dogs should have too much weight ,it is required of dogs to run and make good runs ,dogs are meant to be of good weight in case they chase an intruder. An over weight dog would not be able to run and that can cause problems. So therefore option A is a positive statement. As it explains a positive scenario of the size of the dog and what would be better for it.