FNG,
If you are doing aeros in a Dog you really should have a parachute. The spin characteristics of the Dog vary according to which way it is spinning, L or R, and if you have any aileron applied it is likely to go high rotational. Equally, the RAf had incidences of the Dog not coming out soon enough and the crew jumping out; if you are doing your aeros at a lowish level you may find that you are a tad short of height to recover if you do spin accidentally. I recall Scroggs had a student who took stall recovery action instead of spin recovery, mail him and ask how that went !