They shed hair and skin cells all the time, but especially during grooming. It tends to settle on bedding, carpets and furniture and when disturbed, it floats around in the air. As we breathe, we inhale these tiny particles and that's when the trouble can start.
Touching and stroking animals can also spark an allergic reaction, causing skin irritations and itchy rashes.
Even if you haven't got a four-legged friend in the house, animal dander is all over the place - lurking in the office, on other people's clothes, and virtually everywhere you go. But you can breathe a sigh of relief because there are lots of treatments that give fast relief from pet allergy symptoms.