Health issues. Pugs can catch a cold quite easily and do not tolerate particularly hot or cold weather. Due to their short muzzle, they have a greater tendency towards breathing problems. It is also prone to ailments of the skin and, a condition known as pug dog encephalitis, which is a brain based infection. It is common for the females when giving birth to require a Caesarean section, due in no small part to the size of baby's head. They can also suffer some eye conditions, and it is important not to over feed a pug as they will eat more than they require which will lead to obesity.