I was expecting much more of certain things here -- and much less of others.
I was only a handful of pages in when I first ran across the word "yiff," a sexual term in the furry fetish that doesn't belong in this book. There are other ... comments ... laced throughout, as well as certain disadvantages and one of the templates, that are common things in the furry fetish but will be totally unexpected to Pathfinder players.
As to what's missing ... no turtles? No otters or weasels? The book claims that weasels and otters have the same statistics as rats, and that turtles have the same statistics as dolphins. I looked over the stat blocks and I have grave misgivings about that, and these aren't uncommon or obscure species they're skipping. Meanwhile we have entries for dragonmorphs (useful, but not really relevant) and shoggothmorphs (WHAT?)
The 660 million possible races figure seems to be arrived at by simply figuring out how many possible combinations can be thrown together without any rhyme or reason. It's like claiming that Dungeons and Dragons has hundreds of possible character classes because it contains feats. Not to mention, this also includes a LARGE number of "racial abilities" that are nothing of the kind -- social disadvantages, telling magic riddles, berserker rages, the flippin' Ranma 1/2 curse ... it's not a racial ability if a member of any race could have it or acquire it!
Also: rules for playing video game sprites, cartoon characters, Earth humans turned into furries, and Neanderthals DO NOT BELONG IN THIS BOOK.
I bought this book hoping to be able to use it to add normal furry races to my campaign world -- the sort found in Spellsinger, Ironclaw, World Tree, Usagi Yojimbo, etc. I'm finding myself having to do a lot of "well, I can use THIS to mean THIS, and I can substitute THIS for THAT" just to create major characters from those properties, at which point I'm thinking I could just do it myself from scratch and that I wasted ten dollars.
As is, for all these reasons I wouldn't be comfortable handing this book to a player and saying "make a race," and that's the whole ball game right there.
Pull ALL even remotely sexual or fetishistic material (including the Half-Willing Prey template, which is playing to a fetish I don't even like thinking about), maybe for another book.
Abandon scientific classifications and find a better way to group animal types; multiple entries for subcategories of canines and separate entries for whales and dolphins don't help, and disparate animals like those mentioned above shouldn't be lumped into categories together.
Overhaul the racial advantages/disadvantages list to restrict it to things that are inherent to racial PHYSICAL traits like flight and water-breathing, making sure nothing that could be acquired is listed as inherent.
And remove the silly templates.