1. A method to determine a body condition score of an animal comprising: providing a three-dimensional camera system configured and arranged to record at least one three-dimensional image of the animal, and an image processing device to process the at least one three-dimensional image; recording the at least one three-dimensional image of the animal; processing the at least one three-dimensional image of the animal; wherein the processing of the at least one three-dimensional image comprises: forming a three-dimensional surface representation of a part of the animal from the three-dimensional image recorded by the three-dimensional camera system; determining, in the image, reference points of the animal, including at least one of hook bone points or pin bone points of the animal; selecting a surface part of the animal representative for a body condition of the animal using the reference points; determining an average height for a number of longitudinal lines of the surface part to obtain an average height cross section profile of the animal; determining a first parameter based on the average height cross section profile; analyzing the first parameter representative for a body condition of the animal of the selected surface part; and determining the body condition score based on the first parameter.