Matt takes on three dogs that are in real danger of losing their homes or their lives, including Moneypenny, a snuggly pug that has some severe bullying issues. A beautiful Australian shepherd named Whiskey strikes fear in his owners’ home, and Pax doesn’t bring peace to his owners, who have had to cut themselves off from the outside world.

Matt helps rebuild two families with jealousy and trust issues. Kai and Goober were once bonded brothers but now need Matt’s help to break up their life-endangering aggression. Frankie is a beautiful Chinese Crested whose co-dependent household has turned him from a beautiful lover into a ferocious bully.

National Geographic filmmaker Bertie Gregory travels to the gateways to the poles to film wildlife in two of the harshest environments on the planet: South Georgia Island above Antarctica, and Canada’s frigid North below the Arctic Circle. Surviving in these vastly different environments require cunning, persistence and the ability to adapt to a changing climate. This is the story of Bertie’s quest to capture these wild environments firsthand.

Vets, calves and cats are all having a hard time after getting the cold shoulder from Jack Frost this winter. Farmers, livestock and pets work to adapt while Dr. Pol stays warm the only way he knows how by keeping busy. Dr. Pol doesn't let a little cold weather stop him as he fixes frozen teats, stitches up hard-hided pigs, and helps with the birthing of one huge calf.

In this episode, Simon and Siouxsie will be challenged in ways that will test the faith and trust they need to be a successful snake catching team. They encounter one of the most venomous snakes on earth, a very large black mamba. Capturing and bagging this deadly snake is about timing and precision.

Intelligent, cultured and deadly, the killer whale dominates every ocean on earth and as our planet changes, this top predator changes with it. They are elite, marine hunters with an extremely diverse diet including other apex predators like the great white shark. Killer whales pursue their prey like a pack of wolves and have multiple killing techniques.

In this episode, Simon and Siouxsie will be challenged in ways that will test the faith and trust they need to be a successful snake catching team. They encounter one of the most venomous snakes on earth, a very large black mamba. Capturing and bagging this deadly snake is about timing and precision.

Matt helps two dogs with wild backgrounds - Agedashi, a previously feral blue heeler with violent reactions to strangers, and Lou, a neighborhood street dog with an extreme reactivity to collars. With animal services cracking down on feral dogs, Matt must find a way to break through Lou’s fear of collars before he gets captured and put down.

Matt helps two beautiful but aggressive dogs open up to the possibility of hope and love. A recent widow is at her wits’ end when her grieving guard dog goes into a downward spiral, and a tight-knit family comes to terms with their crippling codependence in order to give its dog the social life he deserves.

A rare event between top ocean predators was captured on video in Florida: bull sharks attacking a great hammerhead. Dr. Heithaus and a team of shark experts launch an investigation pinning one against the other. They put experiments to the test to see what will happen when these top predators come head-to-head.

Dr. Pol's need-for-speed is both a practical necessity and a life-long passion that started way back in Holland where he was a driving instructor! When he's not tending to sick animals he’s burning up the back roads of Isabella County. First stop is a farm where a desperate mare has been in labor for over two days. Dr. Pol and Charles rush to save mother and foal, but are they already too late? Next, the father-son duo race over to Marshall Farms for a few pregnancy checks but the Marshalls have a little something up their sleeves as well. The Marshalls are farmers by day, but by night they’re amateur racecar drivers. They are just days away from a big competition and they want to thank their favorite vet by giving him a chance to drive a victory lap after the race. Almost as good on the road as he is in the operating room, Dr. Pol can’t wait to get behind the wheel - of course driving will have to wait until the car is complete! As the Marshalls work to finish the racecar, Dr. Pol gets to work helping a cockatoo finds its feathers and fixing the stomach of one feisty cow. It's finally time for the race, but duty calls. Dr. Pol has to make a pit stop at the clinic when an emergency brings Pandora, a dog with a badly slit neck, into Pol Veterinary Services. Will Dr. Pol make it to the track on time or will his racecar dreams be left in the dust?

The Pol Clinic vets are up to their coverall collars in clients and the new vet cant start soon enough. When Dr. Emily accepts the position she gets a real Michigan welcome spending her first day out on farm calls getting her hands dirty with Dr. Pol. Dr. Emily may be able to take help with the workload, but Dr. Pol stays busy as he juggles a horse combating colic, a rabbit that can't hop to it, and a working dog named Stitches, with possible head trauma.

Lake Tanganyika, one of the largest lakes on earth combines two very different yet equally magical worlds: an untouched wilderness along the shores, home to chimpanzees, elephants and antelopes and a spectacularly diverse underwater universe. The lake shares many of the ocean’s characteristics. Glorious sunsets, occasional storms with terrifying waves and waters filled with sardines, colorful fish, crabs and even sponges.

Hollywood star Chris Hemsworth has a unique relationship with our oceans’ apex predator. A lifelong fascination born from years of living alongside them. First as a child, now as a prolific surfer at Byron Bay, near his home in New South Wales – one of the shark capitals of the world.

Lake Tanganyika, one of the largest lakes on earth combines two very different yet equally magical worlds: an untouched wilderness along the shores, home to chimpanzees, elephants and antelopes and a spectacularly diverse underwater universe. The lake shares many of the ocean’s characteristics. Glorious sunsets, occasional storms with terrifying waves and waters filled with sardines, colorful fish, crabs and even sponges.