Well, I think friendship could also be a theme. The dog might form bonds with other animals or even some humans, which would be a new kind of relationship compared to when they were human. Also, there could be a theme of self - discovery. The character has to figure out who they are now as a dog and what their purpose is in this new life.
The dog protagonist itself is surely interesting. It has the mind of a human trapped in a dog's body, which creates a lot of comical and also thought - provoking situations.
I'm not sure if it's extremely popular. It's a rather unique and strange concept for a light novel, and it might not have the mainstream appeal that more common themes like fantasy adventures or romances have.
It depends on your taste. If you like isekai (reincarnation in another world) stories, especially those with a non - human protagonist like a slime, then it's probably worth reading. It offers a fresh take on the genre with its own set of rules and concepts for the slime's abilities and growth.
The ending involves the main character achieving a high level of power and forging strong bonds with his companions. He overcomes various challenges and ultimately finds a place in the new world he was reincarnated into.
The exploration of a new world is another typical theme. When reincarnated as a monster, the character is in a different world or at least a different part of their original world. They get to discover new magic systems, cultures of other monsters, and hidden secrets. For instance, in many of these novels, the protagonist discovers unique magic spells or abilities that are specific to the monster species they have been reincarnated into.
Well, there's usually the protagonist who was reincarnated as a werewolf. This character often has the memories of their past life which gives them an edge in dealing with the new challenges. Then there are the other werewolves in the pack. There could be an alpha werewolf who is strong and dominant, leading the pack. And there might be some rival werewolves from other packs who cause trouble for the protagonist and their pack.
It depends on personal preference. If you like vivid visuals and fast - paced action, the manga is a great choice. The manga's art brings the story to life in a unique way. But if you're into more detailed storytelling and getting inside the characters' heads, the light novel is better. It has more in - depth descriptions of the world and the characters' thoughts.
There's likely the main character who is the reincarnated dragon. Their unique perspective as a human turned dragon is quite interesting. And there may be other dragons that they interact with, some might be friendly and some hostile. Also, characters from other races like wise old elves or strong dwarven warriors could be part of the story.