The Pomeranian

Originally descended from sled dogs, this tiny toy breed is about 5 pounds on average, but don't let them know how small they are. This dog is feisty and outgoing and will often act much larger than they actually are. 

 

These fluffy little pups are generally loyal to their families and quite intelligent. They are also very inquisitive and outgoing and willing to challenge just about anything (or anyone) who gets in their way no matter the size. They have been known to bark at or even attack much larger dogs. They can also get snappy with people sometimes. Proper training and socializing along with plenty of exercise should be enough to curb this habit. They are also notorious for excessive barking, so you'll want to address that early on as well. 

Their signature puffy hair style is the result of a dense double coat that they share with all members of the Spitz family, like the Alaskan Malamute. While they do shed quite a bit, all their coat needs for maintenance is routine brushing and occasional baths. 

Overall, these dogs make for great apartment dogs due to their petite stature and relatively low energy requirements. They are loving and loyal and will make a great watchdog while you're not home. Their strong personalities can sometimes lead them to believe that they are in charge of the house, instead of you, so you'll have to make sure to set firm boundaries with this breed or you'll find yourself very well-trained by your dog.