Toxins from algae have been found in the Venice Canals, where multiple dogs have recently died and others have become sick.

Chris Bohmer is currently raising Oasis, a black lab puppy. He’s the 14th guide dog since 2008 that she’s helped train for the organization Guiding Eyes for the Blind.

Next, the team evaluated how accurately each dog could pick out a disease scent it was trained to detect among other smells.