Cynology is a noun that refers to the study of dogs. 

The prefix of our word of the day C-Y-N comes from the Greek word kynos (KYE nos) which means ‘Dog.’ The suffix O-L-O-G-Y means ‘the study of’ as in ‘biology,’ ‘geography’ or ‘archaeology.’ Cynology is often used in a scientific context, for example:

My professor’s work in the field of cynology was interesting, but not exactly groundbreaking. For example, his work revealed that in ancient times, dogs liked to play fetch.