Los Rezagados (Left Behind) tells the story of the animals and caregivers at a non-profit shelter in the city of La Paz, Mexico. Against obstacles such as zero government help towards the safety and wellbeing of companion animals, the lack of an adoption culture in the area and the prejudices against animals with "undesirable features"; the volunteers at the Comunidad Patitas La Paz Animal Sanctuary have been able to unite responsible caretakers with their ideal companion.