You may ask, why are snails such a big deal? Well, these aren't your typical garden snail.
|giant East African snail (Achatina fulica) by Roberta Zimmerman, USDA APHIS, Bugwood.org|
For more on the snail-sniffing dogs: Rescued dogs find new purpose hunting giant invasive snails in the Galapagos
Images: Achatina fulica
The BugwoodWiki: Achatina fulica