Working dogs sniff out invasive weeds in Montana

Seamus, a specially trained scent dog, waits to be rewarded for finding its quarry of the noxious weed Dyer’s woad, during a training session at the base of Mount Sentinel on Wednesday morning.
For pictures, see:
http://missoulian.com/news/state-and-regional/article_796fd810-931d11e0-a643-001cc4c03286.html#ixzz1Q55pPU6P