I know what you mean - I always think that severe obesity in a pet is a type of abuse. There are three different lab/lab mixes on our regular walk route who are all very overweight! One of them struggles to breathe, and when you pat her, her fat just jiggles!
It seems so easy to control a dog's weight (I wish it were so easy to control my own weight - LOL)! If one of our greyhounds starts to get thick around the middle, we reduce their food intake by 1/8 or 1/4 cup for a week or so, and pick up the daily exercise! Pup is a different story, because she has hip dysplasia, and can't get the same exercise as the others. Still, we have her on a diet of weight control food and veggies, just to keep her fit and trim!
It seems so easy; it's always hearkbreaking when a dog is so fat they have trouble moving around