It's mating season and Dr. Oakley is busier than ever with a cow who can't seem to get pregnant and a tricky case of a young caribou bull with growths on his nose. This small infection could spread to the rest of the herd if it's not treated soon.

At the Discovery Park in Alberta, Sierra gets to see how her mom manages physical exams on big cats like jaguars and cheetahs. At the Calgary Zoo, Michelle and Sierra tend to baby meerkats. Before heading home, they tag wild sheep in the mountains.