Rhino Dreams are not predictable in any formal sense. True, they often feature food, but casting the dream seems not to be up to the Dreamer.
As We at YIR have previously mentioned, every Critter is made up of what has been on the Menu. We like vegetation only, so it is no wonder that in Dreamland, We have a greenery aspect. And tantalizing Scent, naturally.
Rhinos pay close attention to Dream Content; our Dreams are often short, so We need our Dreamwits about Us to soak up the Meaning. Or Meanings.