Hi Kathy, welcome to yt! I'm having similar issues with my recently adopted little guy...he too was a stray and was in horrible condition - he's still so thin and is still re-growing the hair on the back half of his body that he lost due to flea infestation and matting.
We think he's about 5 yrs old. We've determined he is "resource guarding" and crazy as it sounds, his most prized possession seems to be my chair! There is lots of good info available on "resource guarding" if you will google that. I'm not sure what to make of Cookie's aggression being directed only at you. Hopefully you will get others' more expert advice on that.
You can read my thread and some of the great advice others have given me, some of which is already working! Good luck...I figure it will take a lot of time and patience to work through the "baggage" these poor little rescue guys bring along with them. Bless you for rescuing him!
