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1. When Olena turned sixteen, she started spending her Saturday mornings at a small animal shelter on the edge of her town. At first she only cleaned cages and filled water bowls, but within a month the staff trusted her to walk the dogs on her own.

2. The shelter is run by just three paid workers, so volunteers are essential. They feed the animals, answer phone calls and help families who come to adopt a pet. Without them, the shelter could look after only half as many animals.

3. Olena admits that the work is not always easy. Some animals arrive frightened or ill, and saying goodbye to a dog she has grown attached to can be hard. “But when a shy puppy finally lets you stroke it, you forget about the tiring parts,” she says.

4. Last spring Olena started a page on social media where she posts photos of the animals waiting for a home. In six months, twenty-three dogs and eleven cats found new families through her posts. Now two of her classmates have joined her on Saturday mornings.