Hello Can anybody tell me about hyperallergenic dogs? I want to get a puppy for Christmas but my son's are allergic

We have a rescued Yorkshire terrier. He has hair.

You can call and Mr. Casey can help you.

I'm not looking now but around the very beginning of December or end of November, because i want it to be a surprise gift for the kids Christmas,so its to soon now, unless I'll find what I'm looking for and have to get it now. But ill be looking for a baby baby pup so we could raise and name it, its going to be our first major major,so i really want us to be hands on from like right after its comes,u know what i mean?