Dander sticks to dog hairs as little bits of skin that detached from your pet. Since we are on the subject, any animal that has feathers or fur can produce dander. You won’t be able to see these bits of skin with your naked eye though. Dander isn’t what causes the allergies though, but the skin as it contains protein. This same protein is also present in a pet’s urine and saliva which is why it isn’t only fur that gives you allergies.