Let me preface this by saying I don't like dogs. I don't hate them—I grew up with them until I moved out—but, well, if I wanted to look after something obnoxiously energetic and desperate for attention, I'd have kids by now. That said, however, I hate it when people living in an apartment (call it a condo all you want, you owning it doesn't mean you aren't still sharing walls and ceiling and floor with strangers) buy a dog. Not because the dog annoys me personally, though they do, but because it's cruel to the animal and disrespectful to your neighbours.
When it comes to your neighbours, unless your dog is trained at the level of a professional service dog, they will bark and run around and just generally make a racket at some point or another when you don't want them to. This is bad when it's in the house next door; sharing a wall/floor/ceiling with it can be, and often is, even worse. As for the dog itself, dogs aren't meant to be kept in small spaces. Even keeping them in too small of a house can have them constantly over-energized without a proper yard or something for them to run in. Apartments are obviously even worse, unless you decide to buy out an entire floor of your building so your dog can have space. Taking them out for a half-hour or an hour walk isn't enough to burn all that energy off unless your dog is hella lethargic or just really old.
So even if you don't care about your neighbours, you should care about your dog. If you have a dog, buy or rent a house instead of a cramped 2-bedroom apartment downtown, and if you're planning on getting a dog while living in an apartment, don't! Not until you're ready to give them the space they need! Considering that a good number of dog owners treat their pets better than other humans, it baffles and infuriates me that this simple point of care is ignored by so many of them.
—Living with a pent-up pooch is no fun for anyone