A friend noted in IRC that his cat wasn't quite getting along with the other tomcat of the area they both moved in.

I couldn't help thinking of this little scene... When I ever come around finishing it, I'll add a speech bubble to the fat cat: "You're the new guy... I like new guys! So I'm gonna make you an offer, you cannot refuse!"
That would also explain the look on the horses face in the background and the smug grin on the henchman's face.