Discover how dogs have evolved from wild predators to friendly pets. Plus, a look at parts of the world where dogs are spoiled as much as children.

Designer Antonio Ballatore and his team build a cats-only treehouse. Linked to the family room, Taffy and her ten-year-old owner can now play in style.

Boone receives an anonymous tip about a hunter who illegally shot a deer. Plus, McGee questions a man for being in possession of venomous copperhead snakes.

As the first snow falls, the Browns make a risky attempt to move their shelters closer to the barn. Noah prepares his pregnant wife Rhain for her first bush winter.

The Wolfpack kids have divided their land between themselves. They're keen to finish building their houses in time as Noah prepares for the baby's arrival.

Donna Stepan runs Sleepy Burrow Wombat Sanctuary. When she takes in a new orphaned baby in critical condition, the next 24 hours become a fight for its life.

Terri helps prepare the zoo's new baby rhino for a life-saving vaccine. Meanwhile, Robert is on a rescue mission to save two black swans in bad shape.

The keepers wave goodbye to two elephant brothers as they start their new adventure at a zoo in Texas. Plus, two African penguin chicks join the colony.

The Raneys help a family struggling to survive in their home made of 30,000 tire bales. They are battling intruding pests, flooding, and unstable walls.

Dr. Jeff visits a free clinic and returns with a dog who was hit by a car. Plus, he helps a dog with a mysterious lump and Dr. Baier wants to keep a rescue puppy.

Wayde and Brett drop in on world famous magicians, Penn and Teller who want a tank built in honour of their 40th anniversary together.

A shocking machete attack on a puppy leaves the medical team fighting to save his life. The Animal Cops embark on the hunt for his attacker.

The team is shocked by a cat's horrific injury. When the Animal Cops hunt for the offender they find more animals suffering in awful conditions.

The Game Wardens educate a dog owner about leaving pets in the sun. An underage drinker tells too many lies. And, Wardens inspect novice jet skiers on a busy lake.

Renowned bear handler Jeff Watson sets out on an adventure to teach his two 700lb grizzly bears, Bob and Screech, how to survive on their own in the wild.

Go behind the scenes with Pete Nelson as he shares some of his favourite, never-before-seen "Treehouse Masters" moments, including lots of lost footage.

A woman travels from San Diego to offer one of Villalobos' senior dogs a home. Meanwhile, Lizzy and Marcel search for a mama dog's lost puppies out in the country.

A vicious cat is preventing Rob and Stephanie from having a baby while Jessica's cat chases her around her house, scratching everything. Can Jackson Galaxy help?

Terri helps prepare the zoo's new baby rhino for a life-saving vaccine. Meanwhile, Robert is on a rescue mission to save two black swans in bad shape.

Dr. Jeff visits a free clinic and returns with a dog who was hit by a car. Plus, he helps a dog with a mysterious lump and Dr. Baier wants to keep a rescue puppy.

Lucas creates a Mediterranean backyard resort with a Caribbean twist. The team builds a paradise with a 30-person hot tub, over 10 fire features, and an outdoor gym.

A team of specialists, armed with the latest technology, try to locate the fabled bigfoot. The start of their search takes them to the forests of Oregon.

The Browns struggle to finish their homes as the ground begins to freeze. Later, Rhain-Alisha goes into labour and the Wolfpack race to be there for the birth.

Game wardens rush to an epic backyard battle between two angry bucks. Kiel responds to a call about a drowning and a trespassing reveals a serious drug offence.

The team builds a Bali-themed enclosure for a blue tongued skink and gifts the clients an additional enclosure for their crested geckos.

Wildlife biologist, Forrest Galante, is in the Maldives in search of a supposedly extinct shark. Unidentified sharks in the area have led many to believe the Pondicherry is alive.

Fisherman and adventurer, Jeremy Wade, travels to western Australia to discover what is wiping out many of the fish in Australia's Fitzroy River. What will he find?