To enhance the welfare of both the client and their pet, it is impossible to ignore the emotional and behavioural aspects of the human-animal bond and focus on purely physiological illness and disease. Not only may behavioural clinical signs be indications of underlying physical disease, but problem behaviour and associated stress can frequently result in physical malaise and illness. This chapter covers the behaviourally sensitive practice, the practice of behavioural medicine on a daily basis, incorporating behaviour into the practice. A poster of Kendal Shepherd’s canine ‘Ladder of Aggression’ is available.