Hi there,
sounds like you frighted yourself. Floating is not that uncommon.
E.g. St Francis of Assisi used to float when he meditated and prayed. His cohorts would have to hold him down. When we have unusual experiences the mind fills in the gaps. If we are fearful it will produce something like what you experienced. There may have been an outside disturbance which set the dog off and it pulled you out of a nightmare at the sametime. The astral doesn't touch on the physical in that way and the bruises on your neck would have been self inflicted, probably while you were dreaming.
Hope this helps.
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