Landfill Park was an active landfill for 14 years, from 1996 to 2008. During this time, Wake County Animal Center (WCAC) brought its euthanized animals there to be dumped.
Now, there are an estimated 25,666 dogs buried there.
In the hopes of attracting potential owners, Johnstone snaps cheery portraits of the WCAC dogs who have the least time left - the ones most at risk of being euthanized. She calls them "Landfill Dogs."
And in Johnstone's photos, the grassy hill, built on trash, serves as a chilling reminder of just how many unwanted shelter dogs have met a sad and avoidable fate over the years.