Pet allergy statistics distinguish allergen sensitization from clinical allergy, symptoms and asthma outcomes. The evidence below spans U.S. NHANES 2005–2006, European birth cohorts, Korean clinic populations and a 19-year-old cohort assessed in a 2026 report.
Key Pet Allergy Statistics
The following figures summarize the most useful measures across populations and study designs:
- In U.S. NHANES 2005–2006, 15.7% of people aged 6 years and older were sensitized to cat and/or dog allergens.
- In U.S. NHANES 2005–2006, 12.1% of people aged 6 years and older were dog-sensitized.
- In U.S. NHANES 2005–2006, 12.4% of people aged 6 years and older were cat-sensitized.
- In a population-based cohort assessed at age 19, 31.1% of 595 participants were sensitized to dog whole allergen at a threshold of at least 0.10 kU/L.
- In the same age-19 cohort, 30.6% were sensitized to cat whole allergen at the same threshold.
- In NHANES 2005–2006, 36.0% of sampled U.S. bedrooms had elevated dog-allergen exposure above the study’s clinical morbidity threshold.
- In NHANES 2005–2006, 29.8% of sampled U.S. bedrooms had elevated cat-allergen exposure above the study’s threshold.
- In U.S. dog-owner bedrooms during NHANES 2005–2006, 84.4% exceeded the dog-allergen threshold, compared with 6.7% of non-dog-owner bedrooms.
- In U.S. cat-owner bedrooms during NHANES 2005–2006, 90.2% exceeded the cat-allergen threshold, compared with 7.1% of non-cat-owner bedrooms.
- Among U.S. asthmatics with dog sensitization and elevated bedroom dog allergen, 23.3% had an asthma attack during the projected 12-month period versus 13.0% without elevated exposure.
- Among U.S. asthmatics with cat sensitization, 17.5% had an asthma attack with elevated bedroom exposure versus 12.2% without it.
- NHANES-based modeling estimated 1,161,000 excess asthma attacks annually associated with elevated bedroom dog allergen in dog-sensitized asthmatics.
- The comparable NHANES-based estimate for elevated bedroom cat allergen was 549,000 excess asthma attacks annually among cat-sensitized asthmatics.
- Across 11 European birth cohorts, pet ownership ranged from about 20% in BAMSE Stockholm to about 60% in the Isle of Wight cohort.
- In a prospective birth cohort of 2,614 children, early cat exposure was associated with age-4 cat sensitization at OR 1.44 (95% CI 1.03–2.01).
- In a Korean clinic testing series, cat sensitization increased from 2.44% in 2011 to 5.65% in 2015.
- In the same Korean series, dog sensitization increased from 2.71% in 2011 to 4.01% in 2015.
- In a small randomized trial, 15 asthmatics received active pet-dander immunotherapy and 9 received placebo injections during the five-month trial phase.
Contents
- Key Pet Allergy Statistics
- How Common Cat and Dog Sensitization Is
- U.S. Pet Allergen Exposure in Bedrooms
- Pet Allergy by Age, Sex and Comorbidity
- Symptoms and Asthma Outcomes After Exposure
- Childhood Pet Ownership and Later Allergy
- Pet Allergy Trends, Testing and Treatment Evidence
How Common Cat and Dog Sensitization Is
Sensitization means allergen-specific IgE or skin-test reactivity at a cited threshold; it is not interchangeable with physician-diagnosed allergy or symptoms after contact. The U.S. estimates below come from serum testing in NHANES 2005–2006, while the newer cohort used whole-allergen and molecular testing.
| Population and period | Measure | Result |
|---|---|---|
| U.S. age 6+, NHANES 2005–2006 | Pet sensitization, cat and/or dog | 15.7% |
| U.S. age 6+, NHANES 2005–2006 | Dust-mite sensitization | 20.3% |
| U.S. age 6+, NHANES 2005–2006 | Dog sensitization | 12.1% |
| U.S. age 6+, NHANES 2005–2006 | Cat sensitization | 12.4% |
| Age 19, cohort of 595 | Dog whole-allergen sensitization | 31.1% |
| Age 19, cohort of 595 | Cat whole-allergen sensitization | 30.6% |
Source: NHANES allergic sensitization study and U.S. pet exposure and asthma morbidity study. The 19-year-old study was published in 2026 and used a whole-allergen threshold of at least 0.10 kU/L: teenage pet-exposure study.
Among animal-sensitized participants in the age-19 cohort, 35.1% were sensitized to at least one of dog, cat or horse. Within that subgroup, 59.3% were sensitized to all three species, 19.6% to two species and 21.1% to only one; among single-species sensitization, dog accounted for 47.7%.
U.S. Pet Allergen Exposure in Bedrooms
Bedroom dust measurements show household exposure, not necessarily airborne exposure at the moment symptoms occur. In NHANES 2005–2006, the median dog-allergen concentration was 0.451 micrograms per gram of bedroom dust and the median cat-allergen concentration was 0.260 micrograms per gram.
- Elevated dog-allergen exposure exceeded the study-defined clinical morbidity threshold in 36.0% of sampled U.S. bedrooms.
- Elevated cat-allergen exposure exceeded the study-defined threshold in 29.8% of sampled U.S. bedrooms.
- Dog-owner bedrooms exceeded the dog threshold in 84.4% of cases, compared with 6.7% among non-dog owners.
- Cat-owner bedrooms exceeded the cat threshold in 90.2% of cases, compared with 7.1% among non-cat owners.
The same exposure sample found elevated cat allergen in 32.2% of female participants’ bedrooms and 27.3% of male participants’ bedrooms. Cat ownership was reported by 28.5% of females and 26.5% of males; these are ownership and exposure figures, not allergy rates.
Source: Sensitization and exposure to pets: The effect on asthma morbidity in the United States population.
Among people reporting that they had removed a cat during the prior 12 months, 34.0% were cat-sensitized; among those reporting recent dog removal, 48.4% were dog-sensitized. Removal was self-reported and may reflect reverse causation or reasons unrelated to allergy: NHANES allergic sensitization study.
Pet Allergy by Age, Sex and Comorbidity
Ownership did not closely track sensitization in the U.S. NHANES comparison. Dog sensitization was 12.2% among dog owners and 12.1% among non-dog owners, a difference that was not statistically significant (p=0.90); cat sensitization was 13.9% among cat owners and 11.9% among non-cat owners, also not statistically significant (p=0.23).
Among NHANES participants with pet sensitivity, dog ownership was reported by 47.0% of asthmatics versus 35.3% of non-asthmatics. Cat ownership was reported by 39.7% of asthmatics versus 28.3% of non-asthmatics, with the difference reported as not clearly significant (p=0.09).
A Korean allergy-clinic series from 2018–2022 included 400 cat-sensitized and 289 dog-sensitized patients. Cat-sensitized patients had a median age of 26 years (IQR 23–32), while dog-sensitized patients had a median age of 27 years (IQR 23–35.5); 61.3% of the cat group and 54.7% of the dog group were female.
| Recorded condition, Korea 2018–2022 | Cat-sensitized | Dog-sensitized |
|---|---|---|
| Allergic rhinitis | 69.5% | 61.9% |
| Asthma | 22.0% | 23.2% |
| Atopic dermatitis | 13.8% | 11.8% |
These are comorbidity rates in a referred clinic population, not national prevalence. Source: Korean cat and dog sensitization study.
Symptoms and Asthma Outcomes After Exposure
The NHANES asthma findings are model-based population estimates derived from observational exposure data. They compare sensitized asthmatics with and without elevated bedroom exposure and do not prove that exposure caused an individual attack.
For dog-sensitized asthmatics, the projected 12-month asthma-attack rate was 23.3% with elevated bedroom dog allergen versus 13.0% without it. The study estimated 1,161,000 excess attacks annually and attributed 44.2% of attacks in the exposed group to elevated dog allergen under its modeling assumptions.
For cat-sensitized asthmatics, the corresponding attack rates were 17.5% with elevated bedroom exposure and 12.2% without it. The study estimated 549,000 excess attacks annually and attributed 30.3% of attacks in the exposed group to elevated cat allergen.
Emergency-care outcomes were also estimated. Emergency asthma-care visits occurred in 7.0% of dog-sensitized asthmatics with elevated bedroom dog allergen versus 3.9% without elevated exposure; of 789,000 projected visits in the exposed group, 349,000 were associated with elevated dog allergen.
In the cat-sensitized exposed group, 746,000 visits were projected, with 352,000 associated with elevated cat allergen.
In the Korean clinic sample, 60.0% of cat-sensitized patients reported symptoms with cat exposure, including sneezing in 48.0%, runny nose in 41.7%, red eyes in 33.5%, dyspnea in 20.5% and cough in 15.5%. Among dog-sensitized patients, 22.5% reported symptoms with dog exposure, including sneezing in 13.1%, runny nose in 12.8%, dyspnea in 9.0%, red eyes in 8.7% and cough in 6.9%.
In the age-19 molecular cohort, asthma upon dog contact rose from 0.9% among participants negative to all tested dog molecules to 40% among those sensitized to six dog molecules. Can f 5 was the most prevalent sensitizing dog molecule at 51.6% among dog-molecule-sensitized participants, while Fel d 1 was the most prevalent cat molecule at 91.2% among cat-molecule-sensitized participants.
Sources: U.S. pet exposure and asthma morbidity study, Korean clinic study and teenage molecular sensitization study.
Childhood Pet Ownership and Later Allergy
Across 11 European birth cohorts, household pet ownership ranged from about 20% in BAMSE Stockholm to about 60% in the Isle of Wight cohort. Only-cat ownership ranged from 4% in Menorca to 28% in the Dutch PIAMA-NHS cohort, while only-dog ownership ranged from 4% in BAMSE to 18% in Menorca and the Isle of Wight.
| Cohort and follow-up | Current asthma | Allergic asthma | Allergic rhinitis | Allergic sensitization |
|---|---|---|---|---|
| ECA Norway, age 10 | 11.9% | 7.6% | 13.9% | 33.2% |
| BAMSE Sweden, ages 8–9 | 9.3% | 5.2% | 8.0% | 26.0% |
The European cohort table uses cohort-specific definitions and follow-up ages. In pooled analysis, owning both a cat and dog was associated with asthma odds ratio 1.04 (95% CI 0.59–1.84), an observational estimate whose interval includes the null: 11-cohort European analysis.
A prospective birth cohort of 2,614 children found early cat exposure associated with cat sensitization at age 4 at OR 1.44 (95% CI 1.03–2.01). Dog exposure was not associated with dog sensitization at age 4, OR 1.16 (95% CI 0.79–1.72); early dog ownership was associated with lower asthma risk, OR 0.50 (95% CI 0.24–1.03), while early cat ownership showed no clear asthma association, OR 0.88 (95% CI 0.56–1.38).
These are adjusted observational associations, and confidence intervals for the dog-asthma and cat-asthma findings include the null: birth-cohort study.
Pet Allergy Trends, Testing and Treatment Evidence
Clinic testing data can show changing sensitization among people who were tested, but they are not national prevalence or incidence. In a Korean allergy-clinic series, dog sensitization rose from 2.71% in 2011 to 4.01% in 2015, while cat sensitization rose from 2.44% to 5.65%.
Across 7,469 tested patients in that series, 3.67% were dog-sensitized and 4.11% cat-sensitized. House-dust-mite sensitization was 16.54% in the same clinic series, compared with 4.11% for cat and 3.67% for dog: Korean sensitization trends.
Treatment evidence is narrower than exposure evidence. In a small randomized trial of patients with cat and/or dog dander allergy, 15 asthmatics received active treatment and 9 received placebo injections during the five-month phase.
After five months, cat-extract immunotherapy significantly reduced bronchial sensitivity to cat challenge (P=0.04). After 12 months, it produced a further significant reduction in bronchial sensitivity to cat (P=0.003), and bronchial histamine sensitivity also decreased significantly (P=0.02).
The trial measured clinical-challenge and physiologic endpoints rather than everyday cleaning outcomes, symptom reduction across all patients or hospitalization prevention. Its small size and extract combinations mean the results should not be generalized to every person with pet allergy: immunotherapy clinical trial.