With warmer temperatures on the rise, state officials are taking special precautions to prevent aquatic invasive species, and when the human eye isn’t sharp enough to detect an invasive mussel, extra canine resources are brought in.

Deb Tiermenstein, the owner of Montana Black Dog Services, trained her dogs, Rosebud and Ismay, to identify aquatic invasive species like the zebra mussel.

“You start with a sample of a mussel […] and you get them focused on that you train them to indicate,” Tiermenstein told MTN. Barking lets Tiermenstein know when an invasive species is present.