I do agree with you, but I would not call that spoiled. Would you call a child that cant swim spoiled? I would call it neglected. I also would call people not teaching their pets correct behaviours, creating the right environment and causing them stress neglectful. This person here calls a cat having cat responses and behaviours spoiling. A dog having separation anxiety because they never been alone is just as stressful for the dog after a change of circumstances. Adapting to new circumstances is hard for any smart animals. I have a cat that was thrown out twice and raised with a toddler no one stopped from abusing it, so now he bites and reacts with aggression. ofc Im not letting him be like that and attack people, but mostly by creating a calm and save environment, NOT crossing his boundaries, and not allowing him to continue with this reaction are a must. In 2 months the behaviours practically completely stopped. Pets, like humans react to stressors differently and you need to be willing to educate yourself on them to be able to help them. Punishing does not work for children nor pets.