he is entering the "i am getting to be older & think i am large & in charge stage"...not so much acting out of spite but trying to control & be the alpha in the house...

he is what..like 9-10 months now? maybe a little older...he is trying to show you that he is the alpha..& by dragging the blanket which has your scent on it that he is top dog (so to speak) in the house & if anyone should be going out it should be him...

question? (not to be personal) do you have your period? that would also be a cause of why he is doing it...it might just be an added component of why he is marking on the blanket...letting everyone know that you are HIS as best he can...

really not a spite thing if you think about dog behavior & take it out of the realm of people behavior.

it would be so much worse if you did not get him fixed...