I have gone through your situation. My Molli was a problem child from day 1. Obedience training helped some but what helped more was exercise. And believe me we went through the barking thing too, spray bottle, pennies in a can and other methods did not work. The only thing that worked was training for that but she still barks when she has too much energy. I take her to the dog park, she goes to doggy day care some times which helps a lot. She loves to play. When she was a puppy my older dog would not play with her because she was too rough. I too wondered if I had made a terrible mistake. I stuck with it and while I won't tell you it was easy I will tell you it was worth it. She is 3 now and although I still have to exercise her way more than my other dog she is a sweetheart. Her and my other dog are best friends now too. I am also training her to be a therapy dog because she loves everyone and I think it might be a good energy outlet. Don't give up.
-also maybe try different treats? even pieces of carrot, apple or even little pieces of boiled chicken might do the trick.
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