Evidence suggests that exposure to certain animals early in life (even before birth) decreases allergies later in life. Other animals seem to make allergies worse.

Sorry, couldn’t find a non-paywall link. Browse to the archive.org link, then stop loading once you can see the text and the pay wall should never come up.

I suspect this is the referenced study for evidence: https://pubmed.ncbi.nlm.nih.gov/36989214/