A dog does go to the vet but he is totally fine, and never even sick (spoiled: the mom is just trying to set daughter up with the vet, so dog probably goes unnecessarily under the pretense of eating a flower)
Mention of the main character’s father leaving them but spoiler: the male main character has a sister they have ostracized which becomes a recurring plot point
It’s very light — the main character is busy and leaves parties without saying goodbye at the beginning and end and it’s joked about. They are not long term goodbyes