Or is it sort of a "act like an animal" type of thing?

(I'd make a great monkey.)

Just got back from another terrific class taught by Mistress Melissa at the Bordello of Decadence (7831 Arroyo Drive in Rosemead) on bastinado (foot torture).  She was the former head mistress at 2 major pro dungeons and is both entertaining/funny and knowledgeable.  Since classes are only $10, I highly recommend to anyone in the Los Angeles area who would like to learn more about BDSM.  They are every Tuesday night, roughly from 8pm to 11pm.

Upcoming classes:

8/30 - Trampling
9/6 - Animal Training/Play
9/13 - FEAR!
9/20 - Mummification
9/27 - Age Play

Since it is humans acting like animals, and not actual animals, no ethical line is crossed.  Rest assured, PETA will not be protesting later.

I would guess that it is something along the lines of pony play, puppy play or kitten play. Submissann is an excellent ponygirl, and here in Phoenix we have a group just for puppy players and their handlers. It can be lots of fun