Cocker horrible behavior

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: I have a mix cocker/bichon. She looks more like a cocker than anything else. She is 1 1/2 and is a fun loving dog. The broblem is her behavior. She can't be alone not one minute...not even if I am in one room and she is in another. : I am currently putting tiles on my floor and I keep her locked in one of the rooms but she scratches the door with force and wants to knock the door down. : When anyone visits the house she urinates all over the place because she is excited and jumps on the visitors. We spent 8 weeks in obedience class where she learned to sit, stay, housebreaking and so forth but she doesn't apply these techniques when visitors are here. : What bothers me the most is her scratching the doors even when she can see me through the glass door and her crying (yelping) loudly. I love my dog but she is driving me crazy and I don't know what to do. : PLEASE HELP ME!!

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