This is a book I probably read in mid 1990s while living in Ashland, KY. It was a paperback, in English, probably around 200-300 pages. I believe the book opened with the main character discussing how he had a pet raccoon, right up until the day that said raccoon got into the medicine cabinet and ate an entire bottle of aspirin, which resulted in fatal stomach damage. A little later, the protagonist is reading a newspaper, and thinking to himself how he always likes to go to the obituaries to find interesting lurid stories about people getting stabbed in the eye with a screwdriver (I remember, as a kid, excitedly checking out our local paper's obituaries and learning that they were much more boring). Then, he embarks on a caving expedition. I don't remember if an accident happened, he got lost, or was just doing the exploring, but he finds himself in another world, and quickly learns that the world is populated by raccoons, with humans only found in books as an unintelligent species of hairless apes found in some parts of the world.
The protagonist wore contact lenses, which I partly remember because he rinses them in a stream (which now seriously weirds me out now that I know what that sort of bacteria can do when trapped against the eye), and might have had a set of glasses. He could juggle, and do Tae-Kwan-Do, because in one scene, he demonstrates his marketable skill as an entertainer by juggling some oranges, ending it with pulping one with a kick, which he then realizes is a bit violent of a skill to be demonstrating. He gets taken in by a raccoon, who I think might have been some sort of a scholar. The raccoons communicate with a sign-language system due to underdeveloped vocal cords, and I remember they do a sort of a hoarse bark as a method to get the attention of someone else to sign to them. Also, the raccoons typically brew their coffee loose, so that they can chew on the grounds at the end of the cup, and I remember the raccoon who adopted him being bemused when the main character not only refuses the grounds, but ruins a piece of paper to filter them out.
I think there's a ruling (religious?) caste that includes mohawked soldiers who fight with spiked gloves that latch to their arm when not in use, but can be flipped into position to fight. One of them was featured on the cover of the book. And at some point near the end, the protagonist is being pursued by them and is attacked by one of their dogs, with him defending himself with trying to kick the oncoming dog in the chest (I think with him noting that this is the best defense against a dog), only to learn that they're wise to that tactic, and outfitted their dogs with spiked collars that cut his leg as he kicks. I want to say that the book ended with one of the members of that caste approaching him and explaining that they need his help. And that's where the book left off, with a sequel that may or may not have ever been written (I got most of my books from the library, and they were notorious for only buying the first book or two in a series, in one case I remember vividly, only carrying the third book in one series).