An oldie but a goodie, first reported by the Seattle-Times in 2005: Debby Cantlon was asked by a friend to care for an abandoned, newborn squirrel found at the base of a tree. The squirrel was no more than one week old - it hadn't yet opened its eyes. It was found near what was thought to be its mother, dead from poisoning. Debby began caring for the squirrel, whom she named Finnegan.
Her pregnant Papillon, Mademoiselle Giselle, actively encouraged the orphan squirrel to join her own litter. Days before Giselle was due to deliver her puppies, she dragged the squirrel's cage to her own bedside. As the Seattle-Times explained, Debby "ultimately decided to allow the squirrel out and the interspecies bonding began":