My Lab acts like a cat & training issues

Question
my 7 month old female lab does everything backwards... she gets in trouble for chewing i tell her No ina very stern voice and take whatever it is she has away from her. i try to give her one of her many chew toys. instead of playing with the toy i just got for her she will search out something else that is not hers to chew. if she has an accident i show her what she did and again tell her no 5 minutes later she will have what seems like intentionally peed on some piece of furniture now most likely one of my chairs on the porch. in addition she seems to have a food obsession every time i try to teach her a new trick now i am working on lay down she get so excited about the treat that she forgets to listen to the command. i don't know how i can train her anything if i can't get her attention to show her the command... please help

Answer
You are making the dog very anxious with all your punishment that doesn't work anyway.  My advice is to take her to a positive training class and learn to train using motivational techniques.  Quit being stern - all that does is make your dog fear you, but it doesn't teach her anything.  Here's a site with some free obedience lessons:
www.clickerlessons.com

When you use food to train with a mouthy dog, you can get in trouble, but that doesn't mean you have to train without treats.  Just make them a bit more boring.  Bits of Cheerios sometimes don't elicit the same response as bits of roast beef.  Or, if your pup is still in the mouthy stage, you can use a tube of squeeze peanut butter, and let her lap her reward.  She gets to lap, but her teeth are not near your fingers.  Plus, because the PB is a bit sticky, she may slow down a bit in looking for the next morsel.

Dogs don't pee "intentionally" out of spite - they DO pee out of anxiety.  This sounds like a dog that has no idea what you want from her, because you really never learned to train properly.
I have a feeling that once you see how smart she really is, you will want to do more of this kind of training - Labs were meant to work with people!

Good books for you - "The Power of Positive Dog Training" by Pat Miller
"The Culture Clash" by Jean Donaldson

Get to class with a good positive trainer!  You won't be sorry.