digitalbusker quoted The Spare Man by Mary Robinette Kowal
Content warning Spoilers for The Spare Man.
"What happened to the dog on the magazine cover?" Tesla had a sudden fear that the fake Haldan had had him put to sleep. "Died of old age at fifteen last year."
— The Spare Man by Mary Robinette Kowal, Mary Robinette Kowal (Page 343)
I knew going in that Tesla's dog was going to be okay, because Kowal assured us it was so. I did not realize the Mary Robinette Kowal Dog Safety Guarantee™️ also covered dogs who are only mentioned briefly, but I'm not surprised. :)