How Big Is A Dogs Brain?
A dog's brain is around 1/125 its body mass. Brain size is usually measured in proportion with the specimen's body mass as variations within species have marked differences in size and sometimes even structure. In comparison, the human brain is 1/40 of its mass, cats have a 1/100 ratio, and elephants have 1/560. This ratio has been roughly used to estimate animal intelligence, although it has been found to be faulty.
This ratio holds among different dog breeds. Recent studies, however, show that different breeds have slightly different brain shapes. This shows that throughout thousands of years of domestication, humans effected change in the species' body shape as well as their mind based on climate and specialized function among other factors.
Researchers have also observed that larger breeds with larger brains are better at short-term memory tests as well as self-control when compared with smaller dogs.