Please let users filter Airbnbs for fenced yards, to allow people with pets and children to find the right stay for them. Having a fenced yard is a requirement for some people. The only alternative is to manually search through Google for "site:airbnb.com fenced yard [location]", then manually open each page and see if it's available.
As another commenter said, filtering for a fenced yard seems at least as useful as filtering for grand pianos and windfalls.