I just wanted to stir up an old thread haha.
1. all dogs have fur which is a type of hair. some dogs have hair that is more animal like, some have hair that is human like. but i don't believe some dogs have hair and some have fur lol.
2. i also agree the size of a dog effects how much dander/allergens are being put off, as well as the type of coat and how much dander it helps hold/drop and even produce. A dog with a more oily coat and skin/silkier coat usually produces less I find vs. a dog with a coarse/dry coat and skin. I find dogs with short hair give me small rashes on my wrists... ANY dog with short hair. Yet soft long haired dogs are fine.
dogs with long hair... seem to be fine! i do have reactions to Maci if she hasn't bathed in awhile... so I also believe being allergic to a dog depends on how often the dog is bathed and how dry their skin gets.
Also, bigs dogs that live outside are more likely to pick up pollens and allergens from trees/flowers/grasses etc as well. Which just make some allergy sufferers, suffer a worse reaction