From the upcoming book, Team of Vipers by Cliff Sims

“I remember being in Wisconsin and your own people were booing you,” Trump said to Ryan according to Sims. “You were out there dying like a dog, Paul. Like a dog! And what’d I do? I saved your a**.”

What is it with Trump and the phrase “dying like a dog.” Canine murder in his past, perhaps? Or is this a common phrase?