Internal anatomy of a Dog Montessori 3 Part Cards! This learning resource contains three part cards for the internal anatomy of a dog. Internal organs included in this booklet: dog, brain, spinal cord, heart, spleen, respiratory system, nasal cavity, trachea, lungs, digestive system, oral cavity, esophagus, stomach, liver, small intestine, large intestine, rectum, kidneys, and bladder. If you would like to expand on this topic, check out my internal parts of a dog booklet, student booklet, and a