To whom does the dog in Dark Tide belong? Although this is a game mainly about fishing, players will also undertake many other tasks, such as those related to a puppy. As you progress through the story, you will find a very skinny yellow dog on the shore that needs to be fed and then picked up and taken onto the boat. Afterward, it needs to be delivered to where it should go. The specific details of the task are shared below; those who need it can have a brief look.

When you encounter the puppy, you can choose to go ashore or continue sailing. It's recommended to go ashore, and you can still choose to continue sailing afterward. Then, head to the old fortress where you can find the researcher. When talking to her, you can trigger the task related to the puppy by asking if she wants to adopt it. This completes the puppy's mission.

After giving the puppy to the researcher, it will regurgitate a ring that you can obtain. If you don't want to give the puppy to the researcher, you can keep it for yourself, but it's still recommended to give it to the researcher.

After a series of plot events, players can trigger two endings. The first is to awaken the ancient god, after which the sea will no longer be peaceful. The second is to seal the ancient god, and the sea will become peaceful again.
To unlock the first ending, when you meet the collector, talk to him and let him follow you out to sea to the location with the red glow. Then, offer a sacrifice to awaken the woman and open the seal.
The second ending requires you to talk to the lighthouse keeper and go with him to the designated location, then throw the book into the sea to seal it. Afterwards, a very large mutant fish will appear and swallow the boat.

This is all there is to share about the tasks related to the dog in Dark Tide. The tasks are not difficult, and you can pick them up as you see fit without needing to deliberately complete certain missions or activities. As for the ending, it depends on your own choice; both can be triggered.