Look, finding a legit preview for stuff like that is always a toss-up. If it's on a major platform like Amazon Kindle or maybe Google Play Books, you can usually peek at the first chapter—just hit the 'Look Inside' thing. But for these indie-published shifter romance titles, the author's personal website or their Patreon might have a sample posted as a teaser. I've noticed some authors use BookFunnel for reader magnets, so signing up for their newsletter could net you a free chapter. The title screams 'web novel origin' to me, honestly; it might have started on a site like Wattpad or Inkitt before going wide. If that's the case, you might still find an early version or some chapters floating around there, though the official published version could be different.
I got burned once downloading a 'preview' from some random forum that was just a badly formatted text dump with half the words missing. Total mess. So I'd stick to the official store pages or the author's own spaces. Sometimes the Amazon sample is painfully short, like just a few pages that end right before anything happens. If the author's smart, they'll make that sample long enough to actually hook you. Otherwise, what's the point, right? It's just frustrating.