The Pug itself will put on weight, be lethargic and females will have irregular heat cycles if any at all. This doesn't happen overnight and may take months before they all show in your dog. Cushing's Disease Also known as hyperadrenocorticism this is the production of too much adrenal hormone, in particular corticosteroids. It can be naturally occurring or caused by over administration of corticosteroids such as prednisone for other problems. Cushing's disease causes increased drinking and urination, increased appetite, panting, high blood pressure, and hair loss - usually evenly distributed on both sides of the body.
Most owners notice a problem when the water intake and urine output are unusually high.
Demodectic Mange Demodex is normally seen in young dogs, under 12 months of age, although any Pug with a stressed immune system can have it. The Demodex mite lives on all dogs and normally lives without a problem. We don't fully understand all the reasons why suddenly some dogs have demodex, but something happens which lowers a dog's immunity to the mite, and the dog suddenly has demodex. There are two forms, localized normally only found in young pups and only in one or two patches on the body. The second form is generalized and begins as localized, but worsens until the patches cover large areas of the Pug.