A Cocker Spaniel's body should be of good proportions with the measurement from their breast bone to back of their thigh just slightly longer than the measurement from their highest point at the shouldersd. Cocker Spaniels should have a deep, wide chest with sufficient room for their internal organs but does not interfere with their gait. Their chest should run no lower that their elbows. Their back should gradually slope slightly downward from their shoulders to their tail.