TV Guide National Geographic Wild

Battles for supremacy in animal clans and families are presented as polar bears feasts like kings, and male giraffes engage in neck-jousting for females.

From changing color to changing shape, some creatures in the animal kingdom can transform to assist in the hunt or as a means of protection.

Dr. Oakley treats a cherished breeding bull, a cat with a worrying lump and a musk ox struggling to walk on his front hooves.

Dr. Oakley treats an emaciated chicken and a dog with a lacerated paw; to help a mini horse, the team needs to get past his protective donkey friend.

Dr. Oakley treats a sheep's large growth and an owl's tiny eye.

Dr. Oakley treats a pair of debilitated chickens and a Highland cow who loves to give hugs.

In Costa Rica, Dr. Oakley treats jaguars, tackles an abscess on a tropical weasel and determines if a rescued sloth can be released into the wild.

Ahead of Sierra's departure for vet school, the team treats an emu, a dog with bulging eyes and a reindeer with a cracked antler.

The Oakleys treat an electrocuted sloth, track the elusive tapir and release rescued animals back into the wild.

Dr. Oakley is on a mission to transport a malnourished orphan bison to his new home.

Dr. Oakley lassos a calf, shears an overgrown sheep and treats a dog with an eye injury.

Dr. Oakley treats a dog with a mysterious nosebleed and an ageing bald eagle; at the Kodiak Rodeo, she competes in a ribbon-pulling contest.

A wide variety of animals make their way to Pol Vet every day, and in this episode, Drs. Nicole and Brenda face an influx of feline cases.

Three vets have the day off and the veteran docs don't skip a beat as they deal with stumbling emus, bruised colts, limping pigs and infected dogs.

Winter weather doesn't deter Pol Vet's dedicated docs as they treat animal eye infections, accidental overdoses and scaly skin conditions.

The docs battle freezing conditions and sub-zero cold weather - and an unseasonal Michigan snowstorm - to make sure their patients are healthy and safe.

There is no time to waste when a playful pup breaks his leg; a duck comes down with diarrhea; and a Chihuahua starts honking like a goose.

A young dog hit by a car needs a full workup to assess her injuries.

A senior dog needs a drastic surgery, and a young horse rider competes.

The vets treat a guinea pig and some pit bulls, while monitoring a Pomeranian's recovery from a dog attack. Dr. Pol treats a cat with an infected face wound.

The busy holiday season arrives, and reindeer, mini-horses, parrots and puppies all need immediate care, but with Christmas around the corner, spirits are high!

It's fall in Michigan, and the Pols are ready for Halloween. The candy bowl is out; the leaves are turning; and clients are in costumes.

In the midst of their cases and cows taking over the parking lot, the staff of Pol Veterinary Services pulls together to help a dog that was hit by a car.