What's the Opposite of Pudding?

The kids have recently gotten interested in learning about opposites.  It all started with a game we created called "Simon Says Across the Mattress."  The rules of the game are just like Simon Says, but you do whatever Simon tells you to do across the crib mattress that we recently replaced on Mikey's bed.  Naturally, the bouncy mattress didn't make its way straight out to the garage.  It made a stop on the living room floor where Mikey and Celia decided jumping onto it from the coffee table was a great way to burn off excess energy (which they are in no short supply of!)  Worrying for the safety of the kids and the furniture, we developed this game.  At first I gave them simple directions like, "Simon says:  Hop on one foot across the mattress."  They were really motivated to follow my directions just because they got to bounce while doing the tasks.  I wonder if I could get them to pick up their toys faster or eat their vegetables while crossing the mattress.  Hmm...note to self.  Anyway, I started giving them mental tasks, too, like, "Simon says:  Name three words that start with C while you cross the mattress," and "Count to twelve,"  and "Tell me your address."  Man, I was feeling great about the objectives I was playfully spinning into this game!  My kids are learning and playing!  Go, me!  Then, I told Mikey to tell me some planets while he crossed the mattress.  His answer was, "Earth, Mars, Penis."  Yeah, that last one was supposed to be Venus.  We'll have to work on that one. 

But the objective that caught their attention the most was opposites.  "Simon says:  Tell me the opposite of black/high/day/tall/short," etc.  They were getting it really quickly!  Yay for my smart kids!  But they couldn't let it go.  In the car, at the table, before bed, the questions barrage me.  "Mommy, what's the opposite of dog?"  I'm stumped.  Cat can't be right although it's the first thing I think of.  Cats and dogs seem to have little in common, but no, wait, they're both mammals, are domesticated animals, are furry, the list goes on and on.  So, Mommy has no answer. I'm quickly realizing that opposites apply to adjectives and adverbs, not nouns, but I'm pretty sure they're not ready for a parts of speech lesson, so I figure I'd better just get more creative for now.  "Mommy, what's the opposite of couch?"  Hmm, again, Mommy's stumped.  Something not soft, not in front of a T.V., not something we sit on.  "Pudding!" I reply.  That's right, kids.  Remember that one for preschool.