Allergy testing is worth discussing before getting a pet if you or someone in your household has symptoms around animals, ongoing hay-fever-like symptoms, asthma that may be allergy-related, or a past reaction to a particular pet. Testing is not usually needed for every person who simply plans to adopt an animal. An allergist can help decide whether testing is useful and interpret results alongside your history.
When should you consider allergy testing before getting a pet?
Allergy testing may be helpful when you have experienced repeated symptoms around cats, dogs, or other animals and are considering bringing one into your home. Signs that may be associated with an animal allergy include:
- Sneezing, a runny nose, or a blocked nose when spending time around animals.
- Itchy, red, or watery eyes after contact with a pet.
- Itchy skin, a rash, or raised patches after an animal licks, scratches, or touches you.
- Coughing, wheezing, chest tightness, or shortness of breath around animals.
These symptoms can have causes other than a pet allergy, including exposure to dust mites, pollen, or other environmental allergens. According to Mayo Clinic, pet allergies can cause symptoms similar to hay fever and, in some people, asthma symptoms. Testing may help identify the relevant allergen when your symptoms and exposure history suggest a possible connection.
If you have asthma or recurring breathing symptoms
Talk with a healthcare professional before adopting a pet if your asthma is difficult to control, or if you notice wheezing, coughing, or chest tightness around animals. Pet allergens may contribute to asthma symptoms, and identifying possible triggers can help inform decisions about your home environment. If you experience rapidly worsening shortness of breath or wheezing, seek urgent medical care rather than waiting for a routine allergy appointment.
What if nobody in the household has had allergy symptoms?
Routine allergy testing is not automatically necessary simply because you are planning to get a pet. If nobody has experienced symptoms or reactions around animals, testing may not provide a clear answer about whether a particular pet will cause future problems. A family history of allergies can be worth mentioning to a clinician, but it does not establish that a family member is allergic to animals. Testing decisions are best based on the person's medical history and specific concerns.
What does pet allergy testing look for?
Pet allergies usually involve proteins found in an animal's skin flakes, saliva, or urine rather than the fur itself. Cat and dog allergens are common concerns, although other animals may also trigger allergic reactions. The relevant allergen depends on the animal and the person's exposure history.
The American Academy of Allergy, Asthma & Immunology (AAAAI) explains that proteins in animal dander, skin flakes, saliva, and urine can cause allergic reactions or aggravate asthma symptoms in some people. The organization also notes that truly hypoallergenic dog and cat breeds do not exist. Choosing a breed with short hair or less shedding therefore cannot guarantee that someone with an animal allergy will avoid symptoms.
Which allergy tests might a doctor recommend?
A healthcare professional will first review your symptoms, exposure history, and medical background. If testing is appropriate, the two main options are a skin-prick test and a blood test that measures specific immunoglobulin E (IgE) antibodies associated with particular allergens. The choice depends on your circumstances, the question being investigated, and whether a test can be performed safely and interpreted meaningfully.
Skin-prick testing
During a skin-prick test, a clinician places a small amount of an allergen extract on the skin, usually on the forearm or back, and gently pricks the surface. The clinician then checks for a local reaction, such as an itchy, raised bump. Results are generally available within about 15 to 20 minutes for cat and dog allergy testing. The procedure can cause temporary itching or swelling, and it should be performed by trained healthcare professionals.
The American College of Allergy, Asthma & Immunology (ACAAI) describes skin-prick testing as a common method for assessing suspected cat and dog allergies. It can help establish whether an animal allergen is relevant when symptoms occur around that animal. A clinician may also investigate other environmental exposures if the symptoms do not clearly point to a single cause.
Allergy blood testing
A blood test can measure specific IgE antibodies to selected animal allergens. A clinician may consider this option when skin testing is unsuitable, such as when certain skin conditions or medications could interfere with the procedure. Blood testing usually does not provide results as quickly as a skin-prick test, and a healthcare professional still needs to interpret the findings in context.
According to Mayo Clinic's guidance on pet allergy diagnosis, blood testing may be used when skin testing cannot be performed in some circumstances. Tell the clinician about all prescription medicines, over-the-counter medicines, supplements, and skin conditions before testing. Do not stop a medication, including an antihistamine, unless your healthcare professional advises you to do so.
How do allergy test results help you decide whether to get a pet?
Test results are one part of the assessment, not a stand-alone answer. A positive result may show that your immune system recognizes an animal allergen, but it does not always mean that exposure causes symptoms in everyday life. A negative result also needs to be considered alongside the clinical history and the type of test performed.
The ACAAI's allergy testing and diagnosis guidance emphasizes that skin and blood test results should be interpreted together with a person's medical history and examination. This is important before choosing a pet because a test result alone cannot fully establish how the person will respond to real-world exposure. Testing also cannot provide a guarantee that symptoms will never develop later.
If results support an animal allergy, discuss the practical implications with an allergist before making a decision. Relevant considerations include the symptoms involved, whether asthma is present, how much exposure is expected in the home, and whether any recommended management measures would be realistic. A positive result does not automatically determine the decision for every household, but breathing symptoms deserve particular care when assessing the risks of regular exposure.
How can you prepare for an allergy appointment?
A little preparation can help the clinician decide whether testing is necessary and which allergens should be included. Before your appointment, make a note of any previous symptoms and the circumstances in which they occurred. Include the type of animal, whether you touched it or were merely nearby, how quickly symptoms appeared, and whether they improved after you left. Mention any history of asthma, eczema, recurring nasal symptoms, or reactions to animals in other homes.
Bring a list of your medicines and any relevant previous test results. Useful questions include whether a skin or blood test is appropriate, what a positive result would mean for your situation, and whether other allergens could explain your symptoms. If you are considering a particular pet, tell the clinician which animal it is so the assessment can focus on a meaningful question rather than an unnecessarily broad panel of tests.
Is testing enough to guarantee that a pet will not cause allergies?
No. Allergy testing can provide useful information about a suspected sensitivity, but it cannot guarantee how someone will respond to an animal in the future. A result needs to be interpreted alongside exposure and symptoms, and a person may have more than one relevant trigger. Likewise, a pet advertised as hypoallergenic is not guaranteed to be suitable for someone with a cat or dog allergy.
The most useful approach is to arrange testing when there is a specific medical reason to do so, understand what the results can and cannot establish, and discuss the decision with a healthcare professional when symptoms or asthma are concerns. This can help you make a better-informed choice before welcoming an animal into your home.