Glad it worked for you. I'm very pleased, since you're one of the first to use the method.
I do believe it is easiest and most effective method for many to establish the out-of-body state.
And yes, that was an OBE (with a bit of confusion).
The entry point from which you initiated the experience was when you already deep in the hypnagogic stage of sleep, during a mini-dream itself, which is why your mental clarity was not entirely up to par, but that's not unusual as you start out.
This is the part that also creates doubt after the experience, but it's common.
It does not diminish the experience even if you were in a slightly dream-like state of consciousness during the OBE itself. It's still an OBE.
Your next one will likely be more lucid, if you remind yourself for the next time to keep a check on it.
Alternatively, you might learn to do it from the waking state eventually, rather than from a stage when you're deep in already. It is easier to maintain mental clarity in that instance, although you will likely also experience all manner of strange sensations in the process, which take some time to get used to (vibrations, visual phenomena, etc.)
The difference between such hypnagogic transitions and transitioning from the waking state is described in the method. It depends on the level of desynchronization between mind and body you're able to establish, which you can get better at over time.
The more often you pull back from these mini-dreams, or any other sort of drifting, the greater the level of desynchronization you'll establish, up until the point that energy sensations will hit you while fully awake and aware lying in bed.
It's not that you have to do that, and I would take any opportunity you have as you start out (as you did), but it can help to establish a more lucid experience without a dream-like feeling or other events that remind you of dreams.
The experience with your growling dog is just some emotional off-loading associated with any subconscious fears about the OBE, which tend to manifest inside of the environment, but it sounds like you quickly overcame that when you started flying up.
The fact that you were looking underneath a bed might have tipped you off that it had to do with fears! The fact that it was in your sister's bedroom I'll leave up to you to interpret, since I do not know your sister
Then you encountered another fear layer, pulling you back to your body. That was probably a good thing, since you might not have remembered the experience otherwise.
Good luck with the next one!