Dogs, and also cats, influence the microbial communities in our homes so much that if your mother lives with a cat or dog while she's pregnant with you, you're about 30% less likely to suffer from allergies as a child.
Parents with allergies are more likely to have children with allergies, although they're not necessarily to the same thing, but identical twins are likely to share specific allergies.
Cinema City in Norwich also allowed more time after the show for a deep clean in case there was any accidents or if anyone with an allergy turned up to the next screening.