![]() Compare a dog’s heart to its body mass and it’s a. The largest animal heart is the blue whale’s, which has been weighed at about 400 pounds (and it is not the size of a small car, contrary to popular belief).īut the animal with the largest heart-to-body-mass ratio is somewhat surprising: the dog. ![]() The human heart is about the size of a fist - and a cow’s heart is the size of a human head. The smallest known mammal by mass, the Etruscan shrew weighs in at under 2 grams and has a 25 beats per second heart rate. ![]() The cheetah has a bit of competition, however, with the Etruscan shrew. A cheetah’s heart beat can go up to 250 BPM in just a few seconds.
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