I've been teaching or helping to teach human-puppy play classes for 5 or 6 years now at various clubs and events around the South. Over that time I've developed a taxonomy of human puppies, based on one originally began by Sir Loki, but which I've continued to adjust and expand. I wrote about this many years ago (here http://pupemrys.blogspot.com/2012/05/puppy-typology.html ), but I think I haven't published an updated version in a while. So here, updated, are my four types of pups (which roughly also yield four types of pup scenes):
Play pups tend to be the very opposite of slave-pups in terms of discipline. Play pups may be in D/s relationships, but they are likely to be ultra-low protocol, and tend to be relatively disinterested in Leather traditions/history. They may also be uninterested in, or even incapable of, deep puppy headspace.
Many play-pups, I also refer to as "Rave Pups," because they tend to mostly turn-out at rave/disco clubs more than traditional leather bars: young, twink boys who like to go out in sexy pup gear to dance, flirt, and act silly (and sometimes "party and play"). There are a growing number of pup-themed nights at various gay clubs around the country, e.g. Puppy Pound in San Francisco, Arf! in Seattle, and The Kennel in LA.
Leather-dog Brue once said: “[Some] may experience a spiritual awakening, enlightenment or discover an animal spirit guide/totem when they go into pupmode. But for many, being a pup/Dog is who they are, it is their core being or soul… I would make barking/growling noises during sex. This had a tendency to unsettle some people and arouse other people even more. I definitely fantasized about being a dog when I was young. Where others wanted to be the soldier or Indian or whatever when playing, I wanted to be a dog: to romp, protect and be near someone. I remember I used to have vivid dog dreams (running in fields, chasing things, etc).”
Of course this taxonomy isn't anything definitive, and there are any number of other ways you could divide up the human-pup community. However, I've found it to be useful, especially for a Handler negotiating a scene with a new puppy. It can be quite disappointing if, e.g., a Handler is expecting a heavy degradation and obedience slave-pup scene and his puppy just wants to cut loose and be silly. This is not a bad framework for thinking about one's style of being a puppy and what one wants to get out of a puppy scene.
I've noticed that (especially) some slave-pups and innate-pups look down on play-pups and gear-pups as "not real," "fake," "superficial," "not serious," etc. I'm not supportive of this attitude. I always teach that everyone can find his own level to play at. Not every pup has to be an innate pup and sleep in a dog kennel every night. People can get out of pup play whatever it is that they get out of it... and leave the rest. I think this also cuts through the (frankly) bullshit debate over: Is puppy play sexual... or is it all about the headspace, or whatever. Yeah, for some it's entirely sexual. For others, it isn't sexual at all. Bottom line: There isn't one way to be a puppy.