So, meet Nessa, probably the tiniest cavalier puppy who is taking the internet by storm with nothing else but his cuteness. The first thing you probably notice about him, other than the beautiful eyes, is his pocket-sized body. While usually cavalier dogs weigh around 12-12lbs, the little Nessa is just 7lbs. However, his weight is not a result of genetic mutation or anything like that, in fact, he was just a runt of the litter.

Nessa's siblings were a little bit luckier and are regular sized dogs. Luckily, being tiny doesn't mean there's anything wrong with Nessa, he's a healthy and happy puppy, who's already two years old and fully grown. Scroll below if you're ready for the cuteness overload! Images Credit: Instagram nessathecavalier.

Well, What kind of puppies stay small forever? There are plenty of ways to choose a dog. Some people look for one of the cutest dog breeds, and others want a dog they can easily train. While there are plenty of milestones to look forward to when you adopt a puppy and watch him grow up, there are some dogs who will always look like puppies, no matter how old they get.

Beagles retain the large eyes and expressive faces of puppyhood throughout their lives — perhaps one of the many reasons why the breed is such a popular choice in American households. Especially if you keep your beagle active and trim, he'll probably act like a puppy for most of his life, too. The AKC characterizes the beagle as "happy-go-lucky, funny, and — thanks to their pleading expression — cute." These energetic dogs get along well with children and with other dogs, and they need plenty of exercise to stay youthful and happy.

The Cavalier King Charles spaniel has an adorable face that retains the big-eyed look of puppyhood forever. The AKC promises, "You can't help being enchanted by the big, twinkling eyes of the Cavalier, a gentle, pint-sized bundle (13 to 18 pounds) of tail-wagging joy."These small dogs like to have a good walk every day, and they get along well with both children and other dogs. They also have affectionate and gentle personalities, which makes them great companions for any loving dog owner.

The Maltese looks adorable at any age. They're known for their flowing white hair, though you can ensure that your Maltese looks like a puppy his entire life by getting regular puppy cuts. (That also reduces the amount of time you'll need to spend brushing, bathing, and detangling!) The AKC reports that these toy dogs are playful, affectionate, and a lot less high-maintenance than you might expect. "Don't let the showy looks fool you: These are hearty, adaptable pets," the group assures potential owners.

Chihuahua;Want a small dog who will keep his puppy face and spunky attitude his entire life? Then you can't go wrong with a Chihuahua. The AKC reports that these tiny dogs "all have large, alert ears, big moist eyes, and huge personalities."These intelligent and enthusiastic dogs typically respond quickly to training. However, you should prepare yourself to teach your Chihuahua about what's acceptable in your household because these sassy little dogs often have their own ideas about who's in charge.

The cocker spaniel has big eyes and a happy smile, a look he'll retain well into adulthood. The AKC reports that cocker spaniels, long one of the most popular breeds in the United States, have "happy, smart, [and] gentle" personalities.These active dogs love brisk walks and playtime, whether in their puppy years or beyond. They also love children and get along well with other dogs. Their agreeable natures make them a great addition to many kinds of households and families.

The Japanese chin may be tiny, but he has a big personality. His instinct to entertain makes him seem like a puppy, even in adulthood. Interestingly enough, the AKC characterizes this sensitive and intelligent breed as "extremely cat-like in nature, smart when they want to be and coy when it suits them." Nonetheless, the Japanese chin can learn to perform tricks. And, just like a puppy, he typically likes to show off in front of an audience.