Three delightful litters of puppies come of age; the first few months of Pugs', Mini-Australian Shepherds' and Rottweilers' lives are full of adventure, including an introduction to an agility course and lessons in duck-herding.

Featured are the epic adventures that take place during the first few months in the lives of Savannah, Siberian and Shorthaired kittens; cats grow up in a house full of guinea pigs, turtles and mice and run off to discover surprising, new territory.

The epic stories of three litters of kittens are followed as they grow from helpless "furballs" into rambunctious, young cats; hairless Sphynxes redine "cute"; Burmese cats explore new heights; tiny Ragdolls befriend German Shepherds.

Three litters of kittens pounce throughout the first few months of their lives; beautiful American Curl kittens get ready for life on the catwalk; a set of Tonkinese run circles around their mother; a Maine Coon shows his siblings who is boss.

Three litters of puppies go from cute to cuter during the first few months of their lives; a trio of Rhodesian Ridgebacks runs circles around their mom; fluffy Chow Chow puppies have heaps of attitude; a Havanese has her paws full with five puppies.

The coming-of-age stories of three litters are featured: three sweet puppies keep their Jack Russell Terrier mother active; a Portuguese Water Dog finds out that her litter may not be too fond of water; a Bullmastiff mother's four puppies keep growing.

Six fluffy Coton de Tulear puppies explore their farm home as one of them, Snowflake, struggles to find its place in the world until it meets Pipsqueak, an awkward baby pygmy goat; a mischievous German shepherd puppy struggles in obedience class.

Oreo, a tiny tuxedo kitten meets a similarly attired companion: Nellie the Skunk. Sputnik leads his Russian Blue siblings on a grand adventure. And, Ocicat Freckles tries to keep control of her five mini jungle cats.

Nanook, a shy Chinook, is the only boy in a litter of four, training to be a sled dog. Rocky, the Labradoodle, and his brother Stanley grow up poolside. And Rollo and Pickles are wiener dogs who aspire to be athletes like their mom, a champion hotdog.

A shy Cavalier King Charles Spaniel is coaxed out of her shell by her peppy aunt. Then, everyone wants to be top dog in the Alaskan Malamute home. Finally, three Dalmatians grow into their spots as they show off their skills at the local fire station.

In this "Best of" episode, viewers get a glimpse of the most adorable inter-species animal friendships. From roly-poly Ragdoll kittens and their German Shepherd playmate, to mini-Australian Shepherds and their quacking duckling pals, it's an extravaganza of cute.

Pit bull puppy Thor discovers an urban paradise where it can be free; Collie pup Little Magic must learn to keep up with its pack mates; Chinese Crested puppies Bella and Buttons, though opposite in appearance, team up against a strange new creature.

Toyger kitten Tonya overcomes her shy nature to befriend a large housemate. British Shorthair kittens audition for the role of "greeter" at a vet's office. And fluffy Ragamuffin Otto keep household chores at bay.

Raisin, a wrinkled Shar Pei, guards his toys from siblings Peaches and Pancake. Scout, a brave young Cairn Terrier, attempts an adventure all on his own. And Peanut, the smallest of a litter of Boxers, is steered to glory by his grandfather.

Five little piggies must befriend Penny the Spaniel and learn their new farm home; Clover, a mini-lop rabbit must assert herself with feisty brother Harley; Samson and Delilah teach their hoglet Pip and her spiky siblings about the great outdoors.

Calico kittens mingle with canine clientele at a dog-grooming salon where their mother works. Exotic Shorthair kittens are born into the lap of luxury, but soon reveal their mischievous side. And a pair of Tabby kittens explore the great outdoors.

Godiva Kiss, a Birman beauty queen, is raising three kittens who may follow in her royal footsteps. Tofu, a Cornish Rex kitten, and his siblings befriend Donna the Iguana. Cutie, a tortoiseshell cat is raising twin brothers that are nothing alike.

An adorable showdown takes place between Pucci the Chihuahua and the new Royal Himalayan kittens. Singapura mom Jasmine has a hard time keeping up with her tiny, energetic brood. Short-legged and long legged munchkin siblings navigate the world.

Puck, a keeshond pup, befriends a flock of ducks on the farm while sister Tulip explores the woodshop. A little Great Dane named Marvin is adjusting to his fast-growing body. Cocker Spaniel pups look the same but certainly don't act the same.

Lab mix rescue pup Sally is never seen far behind brother Safari, Pomeranian triplets Sparrow, Wren and Finch carry on mom Star and dad Tucker's job of watching over a feathered menagerie and Ibizan Hound puppies Carmen, Figaro and Arabella try to out chase each other.

Anya the Doberman pinscher and her human best friend, toddler Kaylee, have a big job keeping up with Anya's 12 new puppies. Runt beagle pup Roo hopes his nose will help him hunt with his sisters. Show dog Bichon Frise Angel breeds her champion brood.

In this best-of episode: Bold little Maine coon kitten Lulu tries to help her dad get along with her siblings. Persian kittens prepare to be like their show cat mom, Truly Elegant. Siberian twins Mittens and Socks are rescued from the closet by Maksim, the cat of the house.

Spotted Bengal kittens are bowled over by a lumbering Newfoundland. 4 fluffy Norwegian Forest Cats dip their toes in the surf at their neighborhood beach, and, at a rescue home, 2 kittens find their way into the den mother's heart.

A shy Papillon puppy named Kitty comes out of her shell with the help of her siblings. A trio of St Bernard puppies follow their noses to big adventures. And finally, an Airedale Terrier named Merlin tries to disappear from her eight brothers and sisters.

Four tiny Tibetan Spaniels - all boys - are born into a family of watchdogs. A extra large litter of Newfoundland puppies take to the water as they train to be rescue dogs. And a patchwork puppy tries to blend into a family of Retriever Mixes.