A tornado warning sends everyone in the clinic, including the animals, down to the basement to ride out a bad storm in the Season 2 opener. Also: Dr. Pol and his son, Charles, diagnose a horse that's rapidly losing weight; and a homework-eating dog gets a spiral notebook stuck in its gums.

Source: National Geographic Wild

Dr. Pol and Dr. Brenda are juggling an explosion of patients. First, Dr. Brenda removes an abscess from a puppy's head. Then, Dr. Pol determines a horses teeth are not aligned, making it difficult for her to chew. He nips the horses teeth, allowing her to comfortably chew her food again. Next, Dr. Pol discovers a sick cow not only has a fever, but is pregnant! The fever is causing the mother to go into premature labor. Will Dr. Pol be able to deliver the calf before its too late?

Source: National Geographic Wild

A veterinary student shadows Dr. Pol for a day as he treats a downed cow at a nearby farm and visits a local breeder and trainer of racehorses to ensure that the animals are in good health for breeding.

Source: National Geographic Wild

The vets treat a beagle with a serious neck injury, a horse in rapidly worsening health and a hairless calf with a poor chance of survival.

Source: National Geographic Wild

A bat gives the Pols a rabies scare.

Source: National Geographic Wild

Twin calves are born; a horse breeder learns that some of his mares are pregnant; a dog can't keep its food down; and a baby goat with an abscess is treated. Also: Dr. Pol and Diane celebrate Mother's Day.

Source: National Geographic Wild

Dr. Pol and Charles reflect on the past year at the clinic as they get ready for the holidays.

Source: National Geographic Wild

Dr. Pol and Diane are convinced the full moon has caused some unpredictable animal behavior, as well as several emergencies at the clinic.

Source: National Geographic Wild

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Temperatures are blazing in Michigan and there are more farm calls than ever. The heat also brings more pregnancy checks and births, leading Dr. Pol and Charles to start their day by heading out to a stable to check the status of some horses. Meanwhile, Dr. Brenda heads to a ranch to vaccinate minihorses, but instead gets some screaming and kicking. By the time she's finished, Dr. Brenda is bruised and bleeding, but she never gives up when it comes to the health of their patients.

Source: National Geographic Wild

The clinic staff members are hit with the flu. Meanwhile, Brenda treats a lethargic dog that may have been exposed to marijuana; and a herd of cows come down with pneumonia.

Source: National Geographic Wild

Dr. Pol hires a new vet, Sandra Wisniewski, who treats a horse suffering from lesions. Meanwhile, Brenda tends to a bloated cow in critical condition.

Source: National Geographic Wild

Dr. Pol tends to animals that are competing in a county fair. Meanwhile, Dr. Brenda delivers a set of bulldog puppies.

Source: National Geographic Wild

Ten Angus steers are suddenly stricken with lameness. Meanwhile, a recent widow brings in a dog that swallowed a rock; and Dr. Pol preps for a family reunion.

Source: National Geographic Wild

Hot weather affects the vets and their animal charges, which include a newborn calf with pneumonia, and a pregnant pig.

Source: National Geographic Wild

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A cow in need of calcium supplements, a crippled horse and a pregnant beagle are treated.

Source: National Geographic Wild