This is a bit of a stereotypical `wild west` sort of "Looks like I win"--"Oh yeah?" thing. The rabbit's won... or has he? The horse seems to think so.

Or, alternatively, there's the situation provided by Anonymous IRC Lady:

<N> Horse has that sort of 'horry shit' sort of expression that makes me grin. :)
<N> Rabbit almost seems to be in the midst of 'Pardon me while I whip this out' even.
<Webster> Not... quite what I was going for.
<Webster> The tiger's supposed to be more of a smirk.
<N> Yeah. Like 'Bah, ain't got nothin on my trouser snake, biatch'.
<N> mweeheehee
* Webster facechests.
<N> The horse looks disturbed to me. And uncomfortable with the situation.
<N> Like he's in a spot he'd rather not be in.
<N> "My, isn't this ... awkward." like.
<N> Perhaps using the hat to hide his own traitorous body reaction. >_>
<N> "Down, Bessie."
<N> heeheeheeheehee
<Webster> Good thing he has a big hat, then.
<N> Ten gallon. *nods sagely*