Training an older rescued JRT

I aquired a female JRT that was found living wild in the forest of the Northern California Coast. I have had her for a little over a year and my vet thinks she's 5 or 6. She is the most devoted terrier I have ever owned and loves me dearly. She is VERY agressive toward other dogs and will run out the door to attack (especially larger) other dogs, she eats from the cat-box, loves to eat discguarded tissue from the waste basket and CONSTANTLY humps legs!!! She also lifts her leg and urinates just like a male dog (sometimeslifting BOTH back legs which is VERY funny!!). My vet suggested hormones but i would rather find a natural method of making her a little less masculine and dominant. ANy suggestions? I have owned dogs (primarily Fox and Cairn Terriers) my whole life and this little lady perplexes me!!!