Hypoallergenic is a term coined by advertisers (based on the Greek prefix hypo meaning "below normal" or "slightly") and first used in a cosmetics campaign in 1953.  It is used to describe items (especially cosmetics and textiles) that cause or are claimed to cause fewer allergic reactions. Allergy is a disorder of the Immune system often also referred to as Atopy. Hypoallergenic pets still produce allergens, but because of their coat type or absence of fur or absence of a gene that produces a certain protein, typically produce fewer allergens than others of the same species. An allergen is a nonparasitic Antigen capable of stimulating a Type-I hypersensitivity reaction in atopic individuals People with severe allergies and asthma may still be affected by a hypoallergenic pet. Asthma is a chronic Condition involving the Respiratory system in which the airways occasionally constrict become inflamed, and are
Note that the term lacks a medical definition, but it is in common usage and found in most standard English dictionaries. In some countries, there are allergy interest groups that provide manufacturers with a certification procedure including tests that ensure a product is unlikely to cause an allergic reaction, but such products are usually described and labeled using other but similar terms. So far, public authorities in no country provide an official certification that an item must undergo before being described as hypoallergenic. The cosmetic industry has been trying for years to establish an industry standard for use of the term. 
For allergy sufferers, a hypoallergenic pet might enable them to have a pet in their home, whereas most dogs, cats, rabbits, and other fur-bearing animals can make their lives miserable. Allergy is a disorder of the Immune system often also referred to as Atopy. A pet is an Animal kept for companionship and enjoyment or a househeld animal as opposed to Livestock, Laboratory animals Working animals The dog ( Canis lupus familiaris) is a domesticated Subspecies of the gray wolf, a Mammal of the Canidae family of the order WikipediaManual of Style (spelling, articles should conform to one overall spelling style of English typically the one most linked to the article topic (if it is geographic Rabbits are small Mammals in the family Leporidae of the order Lagomorpha, found in several parts of the world The proteins that cause allergies are found not only in the animals' fur or hair but also in saliva, urine, mucous, and hair roots and in the dander sloughed from the animals' skin. Dander is material shed from the body of various animals similar to Dandruff or pet pollen
Some dog breeds have been promoted as hypoallergenic, such as the Afghan Hound and the Yorkshire Terrier whose coat (hair) does not shed and is the same pH as human hair creating no danger, Bolognese, Barbet, Maltese, Bichon Frisé, Shih Tzu, West Highland White Terrier, Poodle, Soft-Coated Wheaten Terrier, and the Schnauzer, and Portuguese Water Dogs are sometimes good choices for those who have allergies, because some of these dogs do not shed their hair or shed very little. Dog breeds are groups of closely related and visibly similar domestic Dogs with characteristic traits that are selected and maintained by humans bred from a known foundation The Afghan Hound is a very old Sighthound Dog breed. Distinguished by its thick fine The Yorkshire Terrier (or known as a Yorkie) is a breed of small Dog in the The Bolognese is a small breed of Dog of the Bichon type. Description Appearance The Bolognese is generally considered The Barbet is a breed of Dog, it is a medium-sized French Water dog. A Maltese is a small breed of white Dog of the Bichon type. The Maltese does not West Highland White Terriers, commonly known as Westies, are a breed of Dog known for their distinctive The Soft-Coated Wheaten Terrier A schnauzer (plural schnauzers) is a German dog type which originated in Germany in the 1400s and 1500s However, no canine is known to be completely nonallergenic.
Cat breeds such as the Sphinx, Devon Rex and Cornish Rex, which lack some or all of the normal layers in cats' fur, are believed by mild allergy sufferers to be significantly less likely to provoke an allergic reaction than other breeds. The Sphynx (also known as Canadian Hairless) is a rare breed of Cat known for its lack of a coat. The Devon Rex is a breed of Cat that emerged in England during the 1960s A Cornish Rex is a breed of domestic Cat. The Cornish Rex has no Hair except for down. Siberian cats and Russian Blue are also believed by some to have such properties. The Siberian is a long haired breed of Cat. The Siberian cat breed is recognized by most cat organizations which accept Siberians of any color (including color The Russian Blue is a type or breed of Cat that has a silver-blue coat
A company called Allerca recently claimed to be able to produce a so-called hypoallergenic cat using gene silencing, but it has now instead used traditional breeding methods, starting with cats that naturally lack the gene that produces the glycoprotein Fel d 1 causing an allergic reaction in some people. Cat allergy in humans is an allergic reaction to Cat glycoprotein Fel d 1 secreted by the cat's Sebaceous glands. Gene silencing is a general term describing Epigenetic processes of Gene regulation. The Protein Fel d 1, produced largely by Cat Saliva However, no peer-reviewed studies have confirmed the company's claims and some scientists are skeptical of the company's assertions.  Allerca is currently accepting orders for hypoallergenic kittens.  Another company, Felix Pets, also claims to be developing a breed of hypoallergenic cat.
There is only one known hypoallergenic horse breed. The Bashkir Curly horse has a uniquely textured coat that lacks the protein (present in all other horse fur) believed to be the source of allergic reactions to equines. Many people with severe allergies to horses can handle Bashkir Curlies with no reaction.