Well, there is this research published last year (it's about asthma, though, not allergies as far as I can tell): https://www.nih.gov/news-events/nih-research-

Well, there is this research published last year (it's about asthma, though, not allergies as far as I can tell): https://www.nih.gov/news-events/nih-research-matters/infant-exposure-pet-pest-allergens-may-reduce-asthma-risk https://www.nih.gov/news-events/nih-research-matters/infant-...