I'm also an RVT. A few years ago I went to a lecture where they were showing slides of animals that were normal, overweight, underweight, and obese. There was one slide of a chocolate lab who was obese, and the presenter asked by a show of hands how many people thought the dog was above normal weight. Only about 1/3 of people in the room raised their hand - and keep in mind this was all veterinary professionals. I think the speaker designed the presentation to be a bit misleading to drive home the point that even to vets and RVTs, sometimes obesity can look normalized. But I always found that if a client didn't give a shit about their own weight, they weren't going to care about anything you said about their pet's weight :(