Horsefly,
thanks for opening up your opportunity with us BYC Duck folk! You are going to do well, I know!
I echo the concern that responsibility be emphasized, and that the sheer joy of having healthy, well-cared-for animals is one of the best feelings a person could ever have.
You might explain how animals don't use verbal language, but that if we pay attention, they do "talk" to us quite a bit. The idea of having communication with animals may help the children connect with the topic and instead of "animal as toy," the idea of "animal as friend" could be promoted.