Try as I might, I haven’t yet been able to teach Cass that her frisbee is made of a material that’s more dense than water.  I assume that I am not going about it in the right way.  Because of this failed communication, Cass continues to believe that I should throw her out over bodies of water, so that she can swim out to retrieve it, and I continue to refuse.  I explain that a frisbee at the bottom of the Charles River won’t do either of us any good, but she just thinks I’m being difficult.

Cass with her frisbee in the Charles