Addison's disease (hypoadrenocorticism) is a serious hormonal condition in dogs that is often diagnosed only during a life-threatening adrenal crisis. With appropriate treatment, affected dogs can live normal, healthy lives — making accurate diagnosis essential.
Addison's disease exemplifies the welfare cost of diagnostic delay. A dog with undiagnosed Addison's disease may experience months to years of lethargy, intermittent gastrointestinal upset, reduced appetite, and general malaise before the diagnosis is made — often when an acute crisis forces investigation. During this period, the dog is experiencing the consequences of cortisol and aldosterone deficiency: impaired energy metabolism, electrolyte imbalance, and a stress response system that cannot mount normal responses to physiological challenges. The welfare cost of this chronic state is real but easily overlooked because signs are non-specific and fluctuating. When diagnosis is finally made — often in the context of an Addisonian crisis requiring emergency intensive care — the dog has often been suffering for a prolonged period that could have been shortened with earlier investigation. The transformation after appropriate treatment is often dramatic: dogs described as "always a bit off" suddenly show normal energy, appetite, and enthusiasm. This post-diagnosis improvement reveals the chronic welfare compromise of the undiagnosed period.