What's a good hypo-allergenic pet?

i know poodles dont shed. maybe a lizard.

I always went with Yorkies. My brother had a chinchilla and I think they are.

how about a snake?

reptiles

There are several hypo-allergenic dog breeds.

If you want a dog, some common breeds that are considered hypoallergenic are poodles, yorkshire terriers, bichon frise and the maltese. These breeds tend to shed less and produce less dander, which is what most people are allergic to. Mixed breeds that contain one of these four also tend to be low shedders and less likely to trigger allergy problems, but not always, so check the coat carefully of any mutts you are considering.

Has your son been tested for allergies? Do you know if he is even allergic to dogs &/or cats? My DH is allergic to cats, but not to dogs, so we have two dogs. He's also allergic to a good bit of the green stuff outside, especially grasses, so I'm very conscientious about keeping the dogs brushed & bathed to keep the allergens they bring in on their coats out of the house.

If furry critters will be out of the question, then snakes, fish & iguanas make great pets, too.

fish

There is no such thing as "hypoallergenic dogs". There are some that have less shedding and are less likely to cause reactions, but no dog is hypoallergenic.
Poodles, Shih Tzus, Bichons, Soft Coated Wheaten Terriers are a few. Honestly a good way to figure out what is best is to take your children to visit rescues or breeders and let them spend time with the dogs to see reactions.

I did research on this lately. Apparently, it is true, there are no hypoallergenic dogs or cats.

curly coated retriever or a labradoodle...any dog with curly coat sheds minimally.