As many as three in 10 people in the U.S. experience allergic reactions to cats and dogs, and cat allergies are about twice as common as dog allergies, according to the Asthma and Allergy Foundation of America (AAFA). Animal lovers who happen to have allergies can look for hypoallergenic pets. Hypo means less, not none. In fact, studies have suggested that hypoallergenic dogs can cause as many symptoms as other dogs. People have reported tolerating pets that don’t shed much, require less grooming, or have shorter hair because they may pick up other allergens such as pollen. What causes that an allergic reaction is not necessarily the hair – it’s the saliva proteins that stay on the coat during grooming.