Apartment suitability depends on three things: how vocal a breed tends to be, how much daily exercise it needs, and how well it copes with being alone.
Quieter choices among our breeds include the Havanese, Cavachon, Shih Tzu and Bichon Frise. Pomeranians and Yorkshire Terriers are alert and more likely to announce hallway noise.
Every small breed still needs two proper walks and real mental work each day. Small does not mean low energy.
Plan for toilet training in a building with a lift. Carrying a puppy down for the first few weeks prevents a lot of accidents.
If nobody is home for more than five or six hours a day, arrange a midday visit before your puppy arrives rather than after.
This guide is general information for planning purposes and does not replace advice from your own licensed veterinarian or a qualified trainer who knows your dog.