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Animal allergies are most often caused by three things: dander, saliva and urine. These are considered types of allergens because they can trigger an allergic reaction in sensitive individuals.

Dander is tiny flakes of dead skin that animals continually shed. Proteins that are secreted by oil glands in the animal’s skin are also attached to this dander. Because animals are constantly shedding dander, allergens are deposited around any area in which the animal is present. In contained areas, such as a home, the accumulation of dander is more likely to trigger an allergic reaction in people with animal allergies. However, dander is also deposited within the living environment of other animals (e.g., horses, cows) and pests (e.g., rats, mice).

With most animals, the hair or fur has nothing to do with the allergy response. A short-haired animal can cause as many allergy problems as a long-haired animal. Therefore, there is no such thing as a “hypoallergenic” pet or animal. Hairless breeds of cats, for instance, can still be highly allergenic. However, some types of animals may shed less than others, and people with mild allergies may better tolerate these animals.

Animal saliva is another primary cause of allergy symptoms – especially with animals that groom themselves frequently, such as cats. Allergens dry on the fur after grooming and then these dried substances become airborne. Since the allergens are very light, they can stay in the air a long time. They are also sticky and can adhere to furniture, walls, carpet and other textured surfaces.

Animal urine can also cause allergy symptoms – most commonly in pets with enclosed environments (such as indoor cats, guinea pigs, hamsters). An allergy-causing protein is present in the animal’s urine. As the urine dries, these allergens are released into the air and can trigger an allergic reaction.

Because different animals exude different proteins, there is not one specific protein that causes an allergic reaction. A person could therefore be allergic to mice but not to rats and vice versa.

Many other animals (such as gerbils, horses, cattle, sheep, deer, birds, reptiles and fish) have been known to cause allergic reactions. Also, animal allergies may be triggered by products made from animals, such as wool, down jackets and comforters, feather pillows, fur coats and some upholstery.

Bird allergies are similar to other animal allergies. Allergens are released as the birds molt, preen themselves and shake feather debris into the air. Bird allergies are also associated with bird urine and droppings.

People can also be allergic to cockroach debris – material that includes outer coverings, saliva, eggs and droppings from cockroaches. Like dust mites, cockroach debris can be found in house dust and bedding.

In some people, insect bites or stings can provoke serious or life-threatening reactions (anaphylaxis). Symptoms may include extensive swelling, nausea, fatigue and fever, and anaphylaxis may include trouble breathing, hives, rapid pulse or drop in blood pressure.

People with animal allergies can safely keep pets without fur or feathers, such as fish, snakes, turtles, lizards, frogs, spiders and hermit crabs. Although fish are usually well tolerated, it is important to note that aquariums can add to the humidity in a room, resulting in an increase in mold and dust mites. An additional concern is that fish food powders are often made from seafood, a common allergen.

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The cause of asthma is poorly understood, but it may be partly inherited. Everyone’s lungs are sensitive to different things such as pollen, air pollution, or strong chemicals. In simple terms, people with asthma have lungs that are more sensitive than average.

There are three processes in the lungs that produce asthma symptoms. First, the inner linings of the airways become inflamed. They swell up, leaving less room for air to pass through. Second, the muscles around the airways can tighten, closing them further. Finally, the airways produce mucus in response to the inflammation, clogging the shrunken tubes.

Asthma is in part an allergic response. It may be triggered by some external substance that particularly irritates your lungs. These triggers are often small protein particles called allergens. Some people are sensitive to more than one trigger. Common allergens include:

* grass, tree, and ragweed pollen
* moulds
* house dust mites
* cockroach particles
* animal dander

Other people can get an asthma attack from something they swallow rather than breathe. Examples of these triggers include:

* ASA* and other anti-inflammatory medications
* preservatives found in some drinks or foods
* nuts or shrimp

While most people develop asthma as children, adults can become asthmatic by being exposed to allergens for a long time. People who work with the following products may be at increased risk:

* foams and paints
* antibiotics
* cotton and flax
* detergents
* grains and cereals
* insulation and packaging materials

Asthma attacks can also be triggered by non-allergic irritants such as:

* viral infections such as the common cold or the flu
* laughing hard, crying, shouting
* smog and smoke
* strong smells (e.g., paint fumes, perfumes, cleaning products)
* suddenly breathing cold air
* vigorous exercise

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