Is the St. Bernard Hypoallergenic? Maximum Drool, Maximum Allergen Load

No. The St. Bernard is among the worst choices for allergy sufferers, scoring 2.0 out of 10 — tied for the lowest score in the 99-breed set. Its AKC 5/5 drool rating means saliva-borne Can f 1 is deposited on every surface continuously, and its 120-to-180-pound body amplifies total dander mass beyond what any medium-sized dog produces. People with even mild dog allergy are likely to experience significant symptoms living with a St. Bernard. For those committed to the breed, the strategy is to treat the allergy in the person through medication and potentially immunotherapy — not to rely on environmental management alone.

Two factors drive its 2.0 score. First, the AKC 5/5 drool rating — the maximum — means the breed deposits maximum saliva-borne Can f 1 on every surface it contacts continuously. Can f 1 is a salivary protein (Polovic et al., Allergy, 2013), so maximal drool means maximal saliva-based allergen delivery. Second, at 120 to 180 pounds, the giant body carries a total dander and skin-allergen mass many times larger than a medium-sized dog, even though the per-pound shedding rate (AKC 3/5) is moderate. The near-universal low allergen-production score that all dogs share adds a third anchor pulling the composite to the floor.

It is tied with the Dogue de Bordeaux for the lowest composite score (2.0) in the scoring model used here. Both are maximum droolers (AKC 5/5) with giant bodies; they reach the same floor via slightly different coat profiles. The St. Bernard has a moderate double coat contributing to both shedding and dander, while the Dogue de Bordeaux has a single short coat but higher shedding (4/5). For practical purposes, both represent the most challenging end of the companion dog allergen spectrum, and both require the same honest assessment: avoidance is the most effective intervention.

The St. Bernard scores 2.0 out of 10, placing it in the 'Not hypoallergenic' band at its floor. The score blends five weighted factors: allergen production at 40 percent (low for all dogs), shedding at 20 percent (moderate — AKC 3/5), dander at 15 percent (low — giant-body size penalty applied), saliva spread at 15 percent (the minimum 1 — AKC 5/5 drool), and groomability at 10 percent (limited — double coat on a giant body is hard to maintain at therapeutic frequency). The saliva spread score of 1 out of 10 is the defining score driver.

It can help for a specific subset of allergic people. Intact males produce Can f 5, a prostatic kallikrein not found in females or neutered males (Mattsson et al., JACI, 2009). About 35 percent of dog-sensitized patients have IgE to Can f 5, and some react to it as a primary sensitizer. For those individuals, choosing a neutered male or female St. Bernard reduces one allergen source. However, the dominant concern for most people — Can f 1 — is produced by all dogs regardless of sex or neuter status. Given the scale of this breed's drool-based Can f 1 delivery, Can f 5 management is a useful secondary intervention, not a primary solution.

Severe. The AKC 5/5 drool rating is the maximum, and Can f 1 is secreted in saliva (Polovic et al., Allergy, 2013). When a St. Bernard shakes its head, drool aerosol is released directly into the air near the dog — a particularly efficient inhalation route that bypasses the gradual airborne dispersal typical of dander. Every drool deposit on a hard floor, sofa, or owner's arm is a direct contact-exposure source that persists until cleaned. For a severely allergic person, drool exposure can trigger rapid-onset symptoms — eye watering, sneezing, or asthma symptoms — within minutes of contact.

You can reduce them substantially, but probably not to a level comfortable for a moderately-to-severely allergic person without medical treatment. The most effective measures are: dedicated hard flooring with daily mopping of drool deposits, multiple HEPA air purifiers running continuously, weekly bathing of the dog (or as frequently as feasible), absolute dog-free bedroom, weekly hot-water laundering of all drool-contacted textiles, and microfiber drool wipes used after every meal and play session. Antihistamines and nasal corticosteroids should be part of the protocol, and allergist evaluation for immunotherapy is appropriate for ongoing management.

Can f 1 is a stable lipocalin protein that persists in settled household dust for months — sometimes more than a year in heavily contaminated rooms. For the St. Bernard, dried saliva deposits on hard floors, furniture, and walls are particularly persistent allergen sources: Can f 1 in dried saliva becomes airborne when the area is disturbed by foot traffic, vacuuming, or air currents. A home that has housed a St. Bernard for years is deeply contaminated, and thorough decontamination of carpet, ductwork, and upholstery is required before allergen levels decrease to levels comfortable for a sensitive person.

Potentially, but with honest caveats. Smith and Coop (Ann Allergy Asthma Immunol, 2016) found no clearly reproducible clinical evidence of effectiveness across 40 years of dog AIT studies — a weaker evidence base than for cat allergy, where controlled trials show meaningful benefit. Immunotherapy remains the only disease-modifying option for allergy, retraining the immune system rather than suppressing symptoms, and a course runs three to five years with variable outcomes. For a St. Bernard owner with confirmed dog allergy, immunotherapy under allergist supervision is the best available option when environmental management and medication are insufficient, but realistic expectations are essential.