If a pet keeps scratching or licking itself or plucking its fur out when it does not have fleas, its owner has an indication that the pet is allergic to humans, and improvement in symptoms after a change of environment or in the absence of the pet’s owner would be further evidence.
وإذا خفَّت الاعراض عند الحيوان بعد نقله الى مكان غير المكان الذي يعيش فيه او في غياب صاحبه يكون ذلك برهانا اضافيا على وجود الحساسية .‏