Picture of Hearts of Plenty coloring page

Hearts of Plenty

by Bill B.

Puppy Love

Insects have the smallest hearts, whales have the biggest hearts, but the animal that has the biggest heart proportionally to their body mass is the dog! Dogs in particular have large hearts for their body size. Greyhounds have the largest hearts for their tiny, graceful bodies. If you've ever seen one run, you know they must need tons of oxygen for those slender muscles.