If you live in an apartment environment, it becomes even more important to exercise the pugs to let them run out their energy. If you live in a house, a fenced in yard is ideal. Pugs love to run and having a confined area to run in will provide you peace of mind while letting the pugs have a little fun. They never meet a stranger. Which is quite funny when you think of two 20lb pugs trying to fit around my neck.
Pugs do tend to have genetic problems which can lead to expensive vet bills.
Small nares in the nose which also can cause breathing problems. Eye problems due to their protruding eyes. I, fortunately, haven't had any of these problems with my pugs. However, if you are considering a pug as a pet, you need to be aware of these potential problems. Pugs are extremely loyal and patient little creatures.