Modular box in reinforced fiberglass for 15 to 20 calves from 2 to 6 months of age. It can be used as a shelter for grazing animals, or as an outdoor stable complete with metal fencing in deep hot galvanized steel with a removable front gate, air vents, water-bucket holders and nipple-bucket holders , hay racks, fiberglass feeders and rainproof protections over the buckets.