I don't know if the original creator is still reading these comments, but I'll still write something, maybe a little short... (Spoilers maybe?)
First, from a game design perspective, the writing was really good, I only played it once (and heard a rumour it doesn't actually change much) but I didn't notice any major issues with branching paths or anything... And I'm not really a pet person, when I saw where the story was going, I mostly was just "let the dog die, it will be fine" but as the game went on I kinda got a different perspective, when the dog did die I felt sad, looking back, nothing really mattered, I personally never got to experience anything with the dog, the closest thing was how you met him at the end (and even that was afterwards) and the fact that I didn't care, yet I could understand how you could care without any purpose was impressive, it helps me out into perspective dealing with other people's loss, if my neighbor's pet died, I probably wouldn't care, but now I could understand how to be sympathetic even though I don't care about it personally... That is impressive, good job on the writing