A Canine Search Specialist CSST is a search & rescue certification for K-9s with the mettle to perform dangerous disaster search, rescue & recovery missions. My new K-9 partner, Ryder, a Nova Scotia Duck Tolling Retriever (Toller) has in his 20 months certified Wilderness Rescue, Water Cadaver Recovery and CSST . 43 pounds of unflappable, "got your back" dog powess . There's much more work and play ahead however that will require the high caliber nutrition developed by Eukanuba !