I read the book by the pet psychic on Animal planet. She says that cats/animals have it easier in a way because they don't form their thoughts in words but in images. She says that if you have an image in your head, you cat/animal can see it easier. So if you visualize yourself going home, your furkids can see that too. I've found it to be true as much as I can confirm it.
Aside from that, Calvin must sometimes think his name is "CALVIN NO"! He DOES know "GET DOWN" but I have to say it in a certain firm tone.
Calvin & Hobbes mom