Inhalant allergies in cats are caused by the same common allergens that affect you: dust, grass, trees, mold, pollen, ragweed and so on. They can be seasonal or persistent, and while some breeds may experience the same sniffly, sneezy symptoms humans often suffer, skin reactions are most common. Inhalant allergies can often be treated with the same medications you take, but please don’t treat your cat’s allergies without veterinary supervision.