That Unforgettable Person: In the Case of Aloha

Good evening.
I would like to participate in Rabe-san's project, 'That Unforgettable Person'.

To be honest, I don't have anyone I can't forget in a good way.
There are two or three people who are stuck in my head even though I want to forget them as soon as possible. Haha. I want to forget them, plus I want to punch and kick them, you know? Haha.

In the twilight's deep black, I try to erase the thoughts even further.

Yoiyami no roiro no sara ni omohiketsu
Seasonal word: Twilight (Yoiyami)
There is no way I can end it with a haiku like this. Sweat.

At the hour of the dog, the mist of the Milky Way flows.

Inu no koku seiga no kasumi nagaruru wo
Seasonal words: Milky Way (Autumn), Mist flowing (Summer). This is a seasonal word overlap.

The dog I lived with since I was a student.
He seemed a bit unwell in the morning, so I watched him and took him to the vet in the evening.
They said it was a summer cold and gave him an IV, but he didn't recover, so I took him to the hospital again the next morning.
I told them I didn't care how much it cost and wanted them to run tests, but they wouldn't listen, saying we should just give him antibiotics and another IV and see how it goes.
That evening, ready to storm in and yell at them, I went to the hospital crying, saying,
If you run the tests, I'll be satisfied, so please check every detail. I don't care about the money at all, it doesn't matter how much it costs.
The test results showed a misdiagnosis, and they apologized, saying that if they had noticed by this morning at the latest, it wouldn't have been too late.
An ovarian cyst had ruptured. There was nothing more they could do.
They said he couldn't be saved.

It was a painful decision, as it was cruel to let him suffer any longer.
At the very end, even though he was in pain, he lifted his head, looked slowly at our family's faces, and cried out,
'Woof.'
I will never forget that sound for the rest of my life.
It was the night of Tanabata.

It's not the Tanabata of the lunar calendar, so the seasonal word overlap was intentional.
I'm sorry for such a sad story in the end.
Please forgive me, as he is a dog I will never forget and never want to forget.

Thank you for reading my clumsy haiku again today.
Rabe-san, I'm sorry. I'm sure you're crying.