NO dog can be trusted 100 % off leash, and a rescue dog brings many unknown past experiences that can, and will affect his reliability off leash. (dvgrr.org)
Because almost all of our dogs come to us with unknown pasts, we don't adopt to families with children under 6 unless specifically noted. (norcalgsprescue.org)
Cordwainer Smith's «The Dead Lady of Clown Town» begins in a time when Christianity is no longer even a name, since the Church expired in the ancient, unknown past. (firstthings.com)