Attach bones to dog tail

Hi, I’m new to Blender. I’ve a dog model and I want to try to move the tail. I have added some bones in the tail, but If I rotate this bones, for example, all the dog model rotate. How I can “attach” the armature only to the tail?

Thanks, Roberto

Attachments

dog.blend.zip (1.02 MB)

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Cheers, Clock