Explanation: Some cats are sensitive to dust particles. Most cats are fine with today's silica-based clay cat litter, but a few may be allergic to either the fine dust found in some scoopable litters, or to the scents used in them. Allergy symptoms might include sneezing, runny eyes, and frequent scratching. Fortunately cat litter options include recycled newspapers, pressed sawdust, wheat, wood chips, and play box sand. Although research shows that cats tend to prefer fine-grained, unscented clay litter, experiment to see which your feline friend likes.