When a beloved dog is hit by a car, Dr. Jeff battles to save his shattered leg. Then Dr. Amy takes on a new challenge treating 7 bad-tempered chickens. And a tiny kitten found unconscious at a construction site unites everyone in a fight to save it.

Jeff performs surgery on a pig for the first time; a dog is foaming at the mouth and requires immediate attention; Lindsay gets a surprise when she treats a sick goldendoodle.

A puppy with a broken leg is saved from a shelter in Oklahoma; a dog needs immediate treatment after eating a box of chocolates infused with marijuana.

A puppy has a broken leg after jumping off the back of a truck; Rachel tends to a cat that was injured in a fight with the dog next door; a fourth-grade class hopes Jeff can save their pet hedgehog.

Dr. Jeff races to save the legs of a puppy who has been hit by a car after getting loose. Newly hired exotic pet vet, Dr. Baier, treats a Burmese python that is losing weight.

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Dr. Jeff battles to save a Bearded Dragon who is having a seizure. Then Dr. Nichols must figure out why a family's beloved dog is not eating and struggles to breathe. And, Dr. Amy is put to the test when a routine cat neuter turns complicated.

Dr. Jeff must act fast to save a kitten with head trauma. Then Dr. Amy treats a dog whose weak heart makes surgery a risk. A good Samaritan helps a family when their pit bull is hit by a car. And Dr. Baier gets a workout trying to treat two wallabies.

When two Chihuahuas are found abandoned in a storm drain, Dr. Jeff and his team will do whatever it takes to help them. Then Dr. Jeff makes a surprising discovery when a cat's bizarre eating habits put her life in danger.

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Denver's busiest vet is back, with more patients than ever before. Dr. Jeff fights to help a dog walk again. Dr. Amy operates on a cat with a strange appetite. And the team heads out to a sanctuary to help an injured tiger.

Dr. Jeff operates on a dog rushed to the clinic after a growth on her neck ruptures. A family brings in their rabbit with mysterious growths on her side. And the team performs a risky procedure on a pair of rescued miniature donkeys.

An owner drives nine hours to the clinic hoping Dr. Jeff can save her dog's leg. Jeff and his team head to a wildlife sanctuary to treat a pack of wolves. And when a kitten with a deformed leg needs treatment, Dr. Baier steps up to the plate.

Two sisters rush their dog to the clinic with a life-threatening brain injury. Dr. Jeff is perplexed by a dog with a broken jaw. A fearless cat with a broken leg wins the admiration of the clinic staff. And the team treats some uncooperative yaks.

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Dr. Jeff battles to fix a German shepherd's broken elbow and get him back to his worried owner, a disabled war veteran; a cat with a swollen bladder needs difficult surgery to save its life; Drs. Baier and Hector head to an exotic bird sanctuary.

Dr. Jeff must act fast to save a bulldog after a life-threatening accident; when devastating floods hit Louisiana, Dr. Jeff sends vet tech Hector to rescue pets left homeless in the disaster; Dr. Don operates on a cat with a bad habit.

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In the Season 4 premiere, a black Lab swallows toxic metal; a lost cat is found after a one-and-a-half year absence, but has a mysterious injury; and a tiny dog has a big, life-threatening problem.