Though they thrive without a yard, pugs are energetic little dogs that are fairly active indoors. This breed enjoys taking long walks, but because it can have respiratory issues and gets tired easily, it should always have access to clean water. This breed is ideal for living in an apartment. The pug is incredibly adaptable to a wide range of environments and will accept as much exercise as is offered. But because of his propensity for overeating and laziness, regular exercise is necessary.