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| Carol Guzy / Washington Post |
| Leo, a certified therapy dog, visits client Tanya Olsen, left, at the Oncology and Hematology Infusion Therapy Center clinic in Mountain View, Calif. Marthina McClay, Leo's foster guardian, is at right. |
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| Carol Guzy / Washington Post |
| Leo, a certified therapy dog, visits client Tanya Olsen, left, at the Oncology and Hematology Infusion Therapy Center clinic in Mountain View, Calif. Marthina McClay, Leo's foster guardian, is at right. |
