While the Dewey Decimal System may work, it’s far from perfect.
636.5- Farm animals, how to raise animals, etc.
636.7- Dogs as pets, training, etc.
636.8- Cats as pets, training, etc.
637.3- Cheese making
639.3- Fish as pets, aquariums, etc.
Cheese making? Really?
(This observation courtesy of The Bookslinger.)