I had rotties for years. My favorite dog. Laid back and generally lazy, so tend to get fat. Vets always amazed mine were trim. Fast one day a week, and adjust their food after running a hand along the ribs. Food up, food down.

I have pointers now. Run, run , run. They eat a lot of calories in a day. Beef fat helps fill caloric needs.About a pound a day.

Interestingly rotties are prone to cancer, and pointers are not. While there naybe a genetic compontent, Imho, it is HOW these two breeds use their calories.

My rotties outlived the parent stock , almost doubled the lifespan. Was it the fasting, the fesh veg and fruit, the daily exercise at will......

No reason for our dogs and cats to be overweight. Most are overfed a grain based pet food.