The allergen comes from the dog, not just its coat
A dog allergy is usually a reaction to proteins—not to fur itself. These proteins are produced in substances such as saliva and skin flakes, often called dander. When a dog licks its coat, saliva dries on the hair; skin flakes and dried residue can then spread through a room, settle on furniture, or become airborne when disturbed.
Shedding affects how much loose hair a dog leaves behind, but it is only one route by which allergen-bearing material moves. A dog that sheds little can still produce the proteins, and grooming or close contact can transfer them to a person or their belongings.
Why one dog may be easier to live with
People do not all react to the same dog proteins in the same way, and individual dogs can differ in how much allergen they produce. Exposure also depends on practical factors: how much time someone spends near the dog, whether it sleeps on their bed, and how often the dog and home are cleaned. That can make one dog seem more tolerable than another without making it allergy-proof.
“Hypoallergenic” is therefore best understood as a claim of potentially lower allergen exposure, not a guarantee of no symptoms. For someone with a dog allergy, the important question is not simply how much hair a breed sheds, but whether living with that particular dog leads to meaningful exposure.
