Smaller animals like birds and mice have a higher resting heart rate than larger animals.

“Because in the human literature, there's this statistical claim that, you know, longevity relates inversely to resting heart rate in the sense that you have two billion heartbeats, and depending on your rate, there are some statistics. And I know it's true across species, right? You have these small animals, like birds or mice, that have a very high resting rate.- Mm-hmm. Mm-hmm. Yep. - And then typically, bigger animals have a lower resting rate, and I wonder how that is among dog species.”