Dog allergies are related to a number of other conditions, including other allergies. People with pollen or dust mite allergies may be more likely to also have dog allergies. Also, people with outdoor allergies might experience reactions after contact with a dog, even if they do not have a dog allergy. This is because outdoor allergens such as pollen and mold can get caught in the dog’s fur.

Specific allergies are not inherited, but the tendency to develop an allergy is inherited. If a parent is allergic to dander, for instance, a child has a higher likelihood of developing an allergy of some type, although not necessarily to dander. The risk of developing an allergy is much higher if both parents have allergies. People who are prone to develop allergies are said to be atopic.

Allergies to dogs may trigger other medical conditions. Some of the common conditions related to dog allergies are:

• Allergic rhinitis.  An inflammation of the mucous membranes that line the nose causing nasal congestion, sniffling and sneezing. Dog allergens can cause allergic rhinitis.
  

  

   
• Allergic conjunctivitis. An inflammation of the tissue lining the inside of the eyelid that produces irritation and tearing of the eyes. Dog allergies can cause acute allergic conjunctivitis symptoms.
  

  

   
• Contact dermatitis. An inflammation of the skin that is caused by direct contact with an allergen. A red, bumpy rash may appear when the skin comes into direct contact with dog dander, saliva, blood and urine.
  

  

   
• Asthma. A condition in which the airways become blocked or narrowed causing shortness of breath and breathing difficulty. Asthma can be allergic or non–allergic in origin. Dog allergens can cause both acute and chronic (ongoing) asthma symptoms. The incidence of asthma–like symptoms in dog owners is significantly higher than those who are exposed to other animals. There is also evidence to suggest that people with dog allergies have an increased risk of developing chronic asthma.