What will happen to pet dogs if humans suddenly disappear from the earth?

just look at the wild dogs in Australia.

There are no large carnivores in Australia. The dingo is an exotic species, and its history can be traced back to 5 years ago. It is believed that Australian wild dogs most likely arrived in Australia through the boats of immigrants. At that time, a group of Southeast Asian immigrants came to Australia with some dogs, either as hunting dogs or as "living blankets" for heating at night.

After these immigrants arrived in Australia, for some reason, these dogs were released into the wild actively or passively and became wild dogs. After getting rid of human domestication, these dogs have completely recovered their wildness by relying on the strong adaptability of dogs. Habitually, they live in small groups, and there are strict grades in the community. Only one pair of wild dogs with dominance can breed offspring in each group, and other wild dogs help the leader to raise their cubs. The female leader sometimes kills cubs that are not her own. In terms of feeding habits, they eat almost everything, except small mammals such as rats and rabbits and birds. Dogs often cooperate to hunt large prey such as kangaroos, wombats, sheep, calves and monitor lizards, and even hunt stranded sharks in the sea.

This gentle dog brought by early humans quickly became wild and became the strongest predator in the local area in order to get a chance of survival under special circumstances.

This fact shows that any domesticated dog will recover its wildness in the wild state and become a hunting and dangerous wild animal.