A fluffy Pomeranian in a travel carrier shows why small dogs make the perfect portable companions.

If you want a dog that permanently fits in your lap, several toy breeds stay under 15 pounds for their entire lives. While all puppies grow quickly, dogs like the Chihuahua and Toy Poodle halt their growth at a fraction of the size of standard breeds.

Choosing a perpetually small companion means you can comfortably navigate apartment living, travel effortlessly, and enjoy a pet that feels like a puppy well into its senior years. Before bringing a tiny dog home, it helps to know exactly what to expect at maturity.

We rounded up 15 distinct breeds that stay small permanently, ranging from four-pound pocket pets to sturdy 15-pound lapdogs.