There is no such thing as unmagic! That is NOT a word, you cannot use such a term in a book, it makes no sense. A void, a place without magic, but this is like the whole matter/antimatter dynamic, they can't be here at the same time. You could use dark magic, or death magic, or twisted magic, or the cat man might have been a necromancer... at most I could admit to him being "the unmaker" or "the unravaler", but only if it is a position like a god and goddess of creation and destruction, a necessary part of the equation of life (but that would mean that he could not be destroyed, or if he could that his power would simply transfer to a new host, because if magic is everywhere and will always exist then so must it's counterpart). However it is specifically stated that the cat man is an anomaly that must be destroyed... thereby proving he is a mistake in the grand design of the universe... thereby proving that he is not a soldier for the negative side of all creation... thereby proving that unmagic is NOT the same as the Phoenix Force, NOT the opposite of magic, in which case it cannot be named the opposing force as the "name" unmagic would suggest... which is why no other book that I know of has used the term "unmagic" because there is simply no such thing. Now, if he was a regular, or more powerful than average magic user than it could have been said that he was consuming or stealing the magic from the world and collecting it within himself (or magical objects, though there is no evidence that the cat man has any possessions at all) then that would have been acceptable, and still would have left a void or empty space in the magic (which you could compare to the magic in Magic Study, in which case this story would have a precedent as to how there can be a spot on your map where magic is missing/unavailable to you, and not be completely ridiculous) that the animals would still be compelled to correct, thus allowing the entire story to continue in the same manner as it is written. All in all, it would have been better to write about the struggle between good and bad/light and dark magic instead, because as the book shows there are truly very few instances in which magic is used for harm. Which is the reason the "unmagic" was mentioned at all, meaning that the author simply tried to replace the old overused idea of bad magic with the idea of an opposite to magic. A foolish hypothesis in my opinion especially with the belief that every living thing in this book possesses magic. If it were to be written that there was an opposite to magic (one that is not another form of magic, and if you forget that science and religion are already opposites of magic in many cases) then it would simply have to be something like the Phoenix Force (MARVEL Comics), as in, it would need to be given it's own unique name, not just a prefix on a preexisting term, and the process of using/spreading it would have to be explained, since it sure seems like the cat man goes through the exact same process for using unmagic as one would to use magic. Likewise, how exactly would the unmagic be contained to a glove to be worn by the horse trainer? Magic can be bound to an object, but given that unmagic is simply a hole in the fabric of magic how can one use a hole to make another hole? If you were to carry around a black hole could you use it to create more black holes all over the universe? (I actually don't know if that would be a No answer, since it's never been mentioned in any Star Trek I've seen, or on The Big Bang Theory for that matter) You would need a tool to make the holes, so all in all it is not very well explained, and I wouldn't think this author knows much about the theory of magic as can be researched in hundreds of newly published books every year, if not some of the older ones (which would really be more useful, since all of the new books in the last 10 years or more are just as uninformed and shoddy as this one)
By now I think you get my argument about the term "unmagic", so I will move on to a few other complaints.
First of all, this could have been easily written as from the perspective of only animals like the Warriors series, of which I have found very few books similar to despite the first Warriors series being one of the best books I have ever read (I rank it next to Harry Potter and Artemis Fowl), especially for younger readers. There are very few books that are rated properly these days and with only five or so changes in a sentence here or there this book could have been presented to elementary students, though it still would be below their reading level if our schools are functioning properly.
Second, since the relationship between the bear and the hound began as a friendship there was truly no reason to make it more, especially since everything about their wedding and rule of the kingdom was rushed. Making it all an unimportant footnote that it seems was not intended as a major part of the story is the same as writing a scene that should have been edited out. Likewise they did well as friends/companions there was no need to tell another story about lovers, life isn't always about marriage and children, there are plenty of adventures that just friends can have together (and if that part had been left out this book would have been acceptable for all ages, giving it a completely different target audience. Is that not a good trade? Rewrite the last ten pages or so and sell a couple thousand more copies? How is that not a win?).
Third, length. Congratulations on over 300 pages, though by what? 20ish with a large font? Given that the characters are the same as the first book, and likely they all have a part to play in what follows, combining the story all into one would have made one book twice as long. Anyone who won't read a book because it's too long at 500 pages doesn't really like to read. If its a problem you could have added divider pages to it that say part one/part two (or book one/book two if you prefer).
I have to say that I would never have purchased this book if it had not been available to me for $1 brand new at the dollar store, at least this way I can sell it for $2 at a garage sale... I highly doubt I will read the rest of this series, but if I do I am sure I will have much the same to say as I did today. A disappointment to the written word and the only reason it has two stars instead of one is because with me one star ratings are reserved for the books that deeply offended me or make me want to tear said book to shreds.
*P.S. anyone who reads a review NOT looking for spoilers is a fool, especially online reviews. If you don't know from the info on the back/cover flaps/product description if you want to read it or not then you are obviously trying to research what kind of things happen in the book, WHICH IS LOOKING FOR SPOILERS, so people need to stop writing "Spoiler Alert" on everything or complaining about spoilers.*