"It gave me a new enjoyment for teaching," she said. "It made it feel new and exciting again."
It's not just the small animals learning the ropes and being cared for. Pinkerton staff members often drop off their dogs for grooming time and other services. They ask Hartlen-Mooers questions and seek animal advice.
One dog even came to class after being sprayed by a skunk, looking for a bath and odor removal.
That gave students one more opportunity to learn valuable information about caring for animals and all their needs. Students also learn CPR for pets.
Many hope to take what they learn at PInkerton on to bigger things in life.
"I want to be a veterinarian," Georgia Brust, 16, said. "It's a good chance to learn how to groom."
Catherine Demers, a junior, said she is learning how to handle all sorts of animals.
"This will open up a lot of job opportunities," she said.