There are several optional quests in the game, and many of them are easily missable... usually it's a case of needing to be picked up at specific places during the main story quest progression.
*Pupster's finally wanting to be all spazzy, so I guess it's dance party time. I'll be back around a bit later.
**big hugs all around**
Maybe I will play it normally the first time, then use a guide the second time to get all the quests, it will give me a reason in future to replay the game.
Have a fun day with your little pup.