Early signs in cats are different from those in dogs. Extreme pruritus of the head and respiratory distress due to upper airway obstruction by laryngeal edema, bronchoconstriction and increased mucus production are common. | Early signs in cats are different from those in dogs. Extreme pruritus of the head and respiratory distress due to upper airway obstruction by laryngeal edema, bronchoconstriction and increased mucus production are common. |