Cats are harder to shop for than dogs because they opt out. A cat that dislikes a litter box will simply use somewhere else, and a scratching post in the wrong place gets ignored while the sofa does not.
Placement and texture usually matter more than the product. Litter box size and location drive most avoidance problems, scratching posts need to be tall enough to stretch on and stable enough not to wobble, and water bowls placed next to food get used less than ones placed away from it.
This category covers litter boxes and litter, scratching posts and furniture, carriers, grooming tools for different coat types, feeders and fountains, and enrichment for indoor cats.
Health topics belong with a veterinarian. Changes in litter box habits, grooming, appetite, or weight are worth a call rather than a purchase, since cats hide illness well and a behavior change is often the first sign.
