Of all the affective states that animals experience,disease is of special interest. The indication and the complications of a disease are considered to be among themost
considerable issues of animalwelfare. Likewise, painful and distressed procedures performed on animals are among the most emotive of public concerns regarding animalwelfare.Poor physical health, caused by disease, injury or deformity, is relatively straightforward to recognise and can often be quantified, for example, by scoring how well an animal is walking or the size of lesions on its body
(Dawkins, 2006).Disease reduceswelfare status to the individual animal, the group of animal or thewhole flock. Sheep are capable of not only feeling pain, but also of learning and