Cushing’s disease is the same as hyperadrenocorticism. That is, the adrenal gland is overproducing. Usually, the corticosteroids are overproduced and this causes your pet to have increases in appetite, drinking and urinating, muscle wasting, and panting.
It can be treated, however, it depends on whether the condition is primary or secondary. It may be the adrenal gland itself that is a problem or the hypothalamus, which regulates adrenal output.
Depending on the condition, the treatment of choice is either medical pills or surgery. More often than not, medical treatment is instigated. Consult your vet for an accurate diagnosis.