The signs and symptoms of dog allergies are similar to those of other allergic conditions. Symptoms may include:

• Sneezing
• Coughing
• Wheezing
• Shortness of breath  
• Stuffy nose
• Itchy and watery eyes
• Skin rash

The severity of allergic reactions to dogs varies between patients. Highly sensitive people may begin experiencing symptoms within 15 to 30 minutes of exposure to dog allergens. People who are less sensitive may not develop symptoms for several days after contact with the allergens. The level of dog allergens in an environment also plays a role in the timing of a patient’s symptoms. Symptoms typically occur sooner when allergen levels are high.  

In rare circumstances, a person with a dog allergy experiences anaphylaxis. This is a severe potentially life-threatening allergic reaction that requires emergency medical attention. Symptoms of anaphylaxis include:

• Shortness of breath
• Tightness in the chest
• Swelling of the lips, face, throat or tongue
• Lowered blood pressure