When I was in first grade, I'd already been reading Trixie Belden and Hardy Boys books for about two years, first at bedtime with my mom and then on my own. Anything shorter or for a younger audience, I rolled my eyes at, but while I could read those mysteries during silent reading periods, I was told that I had to read more 'age-appropriate' books for book reports. That was a nightmare for me as well as my mom and grandmother, who had to help me find books that wouldn't bore me to tears. For the most part, it was torture, and then we found this little series about an animal rescue farm.
I picked up the series recently when I saw used copies, mostly on a whim, wondering what I'd think of them as an adult. And, admittedly...as soon as I began reading this one, I was both filled with nostalgia and also left remembering, clearly, that this was least favorite of the four because it is also the most adult of the four, if memory serves, dealing with grief and death far more directly than the others. It's one of those 'lesson' books, involving freedom and the wile, much like Benji the Hunted or Born Free, both of which I loved and cried over more times than I could ever count. This is the same sort of book, and with more heartbreak than I'd generally want to hand to a child, even one who loved wildcats.
I don't think I'd give this book to a child, to be honest, though even now, I'd say that it holds up as a children's book worthy of entertaining adults more than many others I've read (if being a bit dated, having been written/published nearly forty years ago now).
At some point, I'll reread the others in the series and probably enjoy them a bit more. If I remember right, they're less adventure-based, less lesson-based, and probably lighter in general.