
True, some dogs are just very slim and some never carry any weight and a few dogs refuse to eat when there is a bitch in season but most of these will not be being shown. If it is becoming a habit within a breed that they are shown
underweight then it is the responsibility of the judges to halt the trend.
We have all seen it happen a dog with an unusual (even incorrect) feature wins a few times and people start to pick similar dogs for showing or worse breeding for it. The same happens if someone starts to show the dog in a different way, should this dog start winning then everyone will start to adopt a similar way of showing their dogs.
The encouragement or otherwise of the incorrect feature (such as weight) is therefore IMO the responsibility of the judge who should make it clear in their critique that the placed dog was placed despite being, too slim, poor tail carriage, or whatever because.......
Excuse a PM - if the judge was able to critique all dogs this would be easier but if you are chucked, unless you ask, you are not to know why.