Trump doesn't like dogs. One of his go to curses for people he doesn't like is to call them a dog.
This author says he hates them.
Trump observed that Republican senator Marco Rubio was “sweating like a dog” at a 2016 debate. He compared former White House aide Omarosa Manigault Newman to a dog when she published her book Unhinged: An Insider’s Account Of The Trump White House. Trump noted that Republican nominee Mitt Romney “choked like a dog” against Obama in the 2012 election. At various times, NBC’s David Gregory, Fox News’ Glenn Beck and Ted Cruz’s communications directors were all, Trump leered, “fired like a dog”.
https://www.gq-magazine.co.uk/politics/article/donald-trump-dogs#:~:text=“Donald was not a dog,understood Trump's hostility to dogs.
Of course he had something to say about Noem shooting her dog.
“Couple of rough stories, there’s no question about it,” the former president said. “Until this week, she was doing incredibly well. And she got hit hard and sometimes you do books and you have some guy writing a book and you maybe don’t read it as carefully, you know. You have ghost writers do it, they help you, and they, in this case, didn’t help too much.”
https://www.cnn.com/2024/05/14/politics/kristi-noem-trump-dog-killing/index.html