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  Well, Oliver sounds like a very smart guy. Do you think by saying "No" when he barks sounds to him like you are barking with him? 
 
 Jewel was a nipper too. When she would nip me, I yelped, like a dog, REALLY LOUD like she hurt me. Then I would roll her on her back and put my mouth by her throat and growl and kept her that way until she relaxed. Then I'd let her up and praise her.
 
 I don't know if she stopped because I was doing that or if she just grew out of it. I say that because she turned into a pure monster everytime I tried to groom her and the growling thing didn't work for that.
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