For the first introduction momma put the birch only qtips in the tea ball placed it on top of the sand then placed our screen on top. I sniffed the hot container, pawed it and was rewarded. Then she offered me two containers. One cold one hot. I sniffed both and correctly paw indicated on the one with birch. Then she put the two containers on the floor. Easy peasy. I sniffed both (twice in fact just to be sure) and pawed the container with birch.
The next night we went straight to a 3 container practice search 2 cold and one hot. Momma filmed it and I’ll let you see the results for your self.