Is dog and cat fur or hair dangerous to humans if swallowed please explain why that can't be true health wise?

Answer 1

Besides severe Allergies, cat and dog fur is not dangerous to humans. I'm sorry, I can't give you a scientific explanation (maybe someone else can add to this answer), but I can give you the common sense answer: everybody who has dogs or cats ends up eating their hair. It gets all over the house and even into your food. There is actually a Garfield cartoon about it, where Garfield's owner Jon comments on how he always finds at least one cat hair in his food. That is not an exaggeration; I find at least one cat hair in everything I eat, too. Which means there must be others that I haven't noticed, and have inadvertently eaten. Actually, you're going to think I'm disgusting, but sometimes I don't even bother picking the hair out; I just eat it. There's just so many of them, sometimes I get tired of picking them out. Anyway, if cat and dog hair were dangerous to eat, everybody who owns a cat or dog would wind up dead.

I can add scientifically to this answer.

Cat fur and dog hair, like our own hair, are mostly made of the indigestible protein keratin; in fact, hair by any name is over 90% this protein. But while keratin is not nutritious, it does provide some fiber.